qdr.app.tools/UILayoutDefinitionFormat/Definitions/avalonia-controls.xml

<?xml version="1.0" encoding="UTF-8"?>
<!-- Avalonia UI Controls Definition for UI Layout Definition Format -->
<patterns xmlns="ui-layout-patterns">
  
  <!-- Base Avalonia Controls -->
  
  <!-- Content Controls -->
  <control name="AvaloniaButton" type="action" category="avalonia-specific" inherits="Button">
    <constraints>
      <allowed-parents>Panel,StackPanel,Grid,DockPanel,Canvas,WrapPanel,UniformGrid</allowed-parents>
      <allowed-children>any-content</allowed-children>
      <container>true</container>
    </constraints>
    <attributes>
      <attribute name="click-mode" type="enum" values="Release,Press,Hover" default="Release" />
      <attribute name="is-default" type="bool" default="false" />
      <attribute name="is-cancel" type="bool" default="false" />
      <attribute name="hotkey" type="string" default="" />
      <attribute name="command" type="string" default="" />
      <attribute name="command-parameter" type="object" default="null" />
    </attributes>
    <behavior>
      <event name="click" required="true" />
      <event name="command-changed" />
    </behavior>
  </control>
  
  <control name="RepeatButton" type="action" category="avalonia-specific">
    <constraints>
      <allowed-parents>Panel,StackPanel,Grid,DockPanel,Canvas</allowed-parents>
      <allowed-children>any-content</allowed-children>
      <container>true</container>
    </constraints>
    <attributes>
      <attribute name="delay" type="int" default="500" min="0" max="5000" />
      <attribute name="interval" type="int" default="33" min="1" max="1000" />
    </attributes>
    <behavior>
      <event name="click" required="true" />
    </behavior>
  </control>
  
  <!-- Layout Panels -->
  <control name="StackPanel" type="container" category="avalonia-layout">
    <constraints>
      <allowed-parents>Panel,Grid,DockPanel,Canvas,ScrollViewer,Border</allowed-parents>
      <allowed-children>any-control</allowed-children>
      <container>true</container>
    </constraints>
    <attributes>
      <attribute name="orientation" type="enum" values="Horizontal,Vertical" default="Vertical" />
      <attribute name="spacing" type="double" default="0" min="0" max="100" />
    </attributes>
  </control>
  
  <control name="Grid" type="container" category="avalonia-layout">
    <constraints>
      <allowed-parents>Panel,StackPanel,DockPanel,Canvas,ScrollViewer,Border</allowed-parents>
      <allowed-children>any-control</allowed-children>
      <container>true</container>
      <requires-structure>grid-definitions</requires-structure>
    </constraints>
    <attributes>
      <attribute name="show-grid-lines" type="bool" default="false" />
    </attributes>
    <structure>
      <grid-definitions>
        <row-definitions>
          <row-definition height="*" min-height="0" max-height="Infinity" />
        </row-definitions>
        <column-definitions>
          <column-definition width="*" min-width="0" max-width="Infinity" />
        </column-definitions>
      </grid-definitions>
      <children>
        <child grid-row="0" grid-column="0" grid-row-span="1" grid-column-span="1" />
      </children>
    </structure>
  </control>
  
  <control name="DockPanel" type="container" category="avalonia-layout">
    <constraints>
      <allowed-parents>Panel,StackPanel,Grid,Canvas,ScrollViewer,Border</allowed-parents>
      <allowed-children>any-control</allowed-children>
      <container>true</container>
    </constraints>
    <attributes>
      <attribute name="last-child-fill" type="bool" default="true" />
    </attributes>
    <structure>
      <children>
        <child dock="Left,Top,Right,Bottom,None" />
      </children>
    </structure>
  </control>
  
  <control name="WrapPanel" type="container" category="avalonia-layout">
    <constraints>
      <allowed-parents>Panel,StackPanel,Grid,DockPanel,Canvas</allowed-parents>
      <allowed-children>any-control</allowed-children>
      <container>true</container>
    </constraints>
    <attributes>
      <attribute name="orientation" type="enum" values="Horizontal,Vertical" default="Horizontal" />
      <attribute name="item-width" type="double" default="NaN" min="0" />
      <attribute name="item-height" type="double" default="NaN" min="0" />
    </attributes>
  </control>
  
  <control name="Canvas" type="container" category="avalonia-layout">
    <constraints>
      <allowed-parents>Panel,StackPanel,Grid,DockPanel,ScrollViewer</allowed-parents>
      <allowed-children>any-control</allowed-children>
      <container>true</container>
    </constraints>
    <attributes>
      <attribute name="background" type="brush" default="Transparent" />
    </attributes>
    <structure>
      <children>
        <child canvas-left="0" canvas-top="0" canvas-right="NaN" canvas-bottom="NaN" />
      </children>
    </structure>
  </control>
  
  <control name="UniformGrid" type="container" category="avalonia-layout">
    <constraints>
      <allowed-parents>Panel,StackPanel,Grid,DockPanel,Canvas</allowed-parents>
      <allowed-children>any-control</allowed-children>
      <container>true</container>
    </constraints>
    <attributes>
      <attribute name="rows" type="int" default="0" min="0" max="100" />
      <attribute name="columns" type="int" default="0" min="0" max="100" />
      <attribute name="first-column" type="int" default="0" min="0" />
    </attributes>
  </control>
  
  <!-- Input Controls -->
  <control name="AvaloniaTextBox" type="input" category="avalonia-input" inherits="TextBox">
    <constraints>
      <allowed-parents>Panel,StackPanel,Grid,DockPanel,Canvas</allowed-parents>
      <allowed-children>none</allowed-children>
      <container>false</container>
    </constraints>
    <attributes>
      <attribute name="accepts-return" type="bool" default="false" />
      <attribute name="accepts-tab" type="bool" default="false" />
      <attribute name="caret-index" type="int" default="0" min="0" />
      <attribute name="selection-start" type="int" default="0" min="0" />
      <attribute name="selection-end" type="int" default="0" min="0" />
      <attribute name="text-wrapping" type="enum" values="NoWrap,Wrap" default="NoWrap" />
      <attribute name="watermark" type="string" default="" />
      <attribute name="password-char" type="char" default="" />
      <attribute name="reveal-password" type="bool" default="false" />
      <attribute name="use-floating-watermark" type="bool" default="false" />
    </attributes>
    <behavior>
      <event name="text-changed" />
      <event name="text-changing" />
      <event name="selection-changed" />
      <event name="copy" />
      <event name="cut" />
      <event name="paste" />
    </behavior>
  </control>
  
  <control name="NumericUpDown" type="input" category="avalonia-input">
    <constraints>
      <allowed-parents>Panel,StackPanel,Grid,DockPanel,Canvas</allowed-parents>
      <allowed-children>none</allowed-children>
      <container>false</container>
    </constraints>
    <attributes>
      <attribute name="value" type="double" default="0" />
      <attribute name="minimum" type="double" default="0" />
      <attribute name="maximum" type="double" default="100" />
      <attribute name="increment" type="double" default="1" />
      <attribute name="format-string" type="string" default="F0" />
      <attribute name="text" type="string" default="" />
      <attribute name="watermark" type="string" default="" />
      <attribute name="show-button-spinner" type="bool" default="true" />
      <attribute name="allow-spin" type="bool" default="true" />
      <attribute name="button-spinner-location" type="enum" values="Right,Left" default="Right" />
    </attributes>
    <behavior>
      <event name="value-changed" />
      <event name="spin" />
    </behavior>
  </control>
  
  <control name="AvaloniaComboBox" type="input" category="avalonia-input" inherits="ComboBox">
    <constraints>
      <allowed-parents>Panel,StackPanel,Grid,DockPanel,Canvas</allowed-parents>
      <allowed-children>ComboBoxItem</allowed-children>
      <container>true</container>
    </constraints>
    <attributes>
      <attribute name="is-dropdown-open" type="bool" default="false" />
      <attribute name="max-drop-down-height" type="double" default="200" min="0" />
      <attribute name="placeholder-text" type="string" default="" />
      <attribute name="placeholder-foreground" type="brush" default="Gray" />
    </attributes>
    <behavior>
      <event name="dropdown-opened" />
      <event name="dropdown-closed" />
    </behavior>
    <structure>
      <items>
        <ComboBoxItem content="" is-selected="false" />
      </items>
    </structure>
  </control>
  
  <control name="AutoCompleteBox" type="input" category="avalonia-input">
    <constraints>
      <allowed-parents>Panel,StackPanel,Grid,DockPanel,Canvas</allowed-parents>
      <allowed-children>none</allowed-children>
      <container>false</container>
    </constraints>
    <attributes>
      <attribute name="text" type="string" default="" />
      <attribute name="search-text" type="string" default="" />
      <attribute name="watermark" type="string" default="" />
      <attribute name="minimum-prefix-length" type="int" default="1" min="0" max="10" />
      <attribute name="minimum-populate-delay" type="int" default="0" min="0" max="5000" />
      <attribute name="maximum-drop-down-height" type="double" default="600" min="0" />
      <attribute name="is-drop-down-open" type="bool" default="false" />
      <attribute name="filter-mode" type="enum" values="None,StartsWith,StartsWithCaseSensitive,StartsWithOrdinal,StartsWithOrdinalCaseSensitive,Contains,ContainsCaseSensitive,ContainsOrdinal,ContainsOrdinalCaseSensitive,Equals,EqualsCaseSensitive,EqualsOrdinal,EqualsOrdinalCaseSensitive,Custom" default="StartsWith" />
    </attributes>
    <behavior>
      <event name="text-changed" />
      <event name="populating" />
      <event name="populated" />
      <event name="dropdown-opening" />
      <event name="dropdown-opened" />
      <event name="dropdown-closing" />
      <event name="dropdown-closed" />
      <event name="selection-changed" />
    </behavior>
  </control>
  
  <control name="CheckBox" type="input" category="avalonia-input">
    <constraints>
      <allowed-parents>Panel,StackPanel,Grid,DockPanel,Canvas</allowed-parents>
      <allowed-children>any-content</allowed-children>
      <container>true</container>
    </constraints>
    <attributes>
      <attribute name="is-checked" type="bool" default="false" />
      <attribute name="is-three-state" type="bool" default="false" />
    </attributes>
    <behavior>
      <event name="checked" />
      <event name="unchecked" />
      <event name="indeterminate" />
    </behavior>
  </control>
  
  <control name="RadioButton" type="input" category="avalonia-input">
    <constraints>
      <allowed-parents>Panel,StackPanel,Grid,DockPanel,Canvas</allowed-parents>
      <allowed-children>any-content</allowed-children>
      <container>true</container>
    </constraints>
    <attributes>
      <attribute name="is-checked" type="bool" default="false" />
      <attribute name="group-name" type="string" default="" />
    </attributes>
    <behavior>
      <event name="checked" />
      <event name="unchecked" />
    </behavior>
  </control>
  
  <control name="Slider" type="input" category="avalonia-input">
    <constraints>
      <allowed-parents>Panel,StackPanel,Grid,DockPanel,Canvas</allowed-parents>
      <allowed-children>none</allowed-children>
      <container>false</container>
    </constraints>
    <attributes>
      <attribute name="value" type="double" default="0" />
      <attribute name="minimum" type="double" default="0" />
      <attribute name="maximum" type="double" default="10" />
      <attribute name="small-change" type="double" default="0.1" />
      <attribute name="large-change" type="double" default="1" />
      <attribute name="tick-frequency" type="double" default="0" />
      <attribute name="tick-placement" type="enum" values="None,TopLeft,BottomRight,Both" default="None" />
      <attribute name="is-snap-to-tick-enabled" type="bool" default="false" />
      <attribute name="orientation" type="enum" values="Horizontal,Vertical" default="Horizontal" />
    </attributes>
    <behavior>
      <event name="value-changed" />
    </behavior>
  </control>
  
  <control name="CalendarDatePicker" type="input" category="avalonia-input">
    <constraints>
      <allowed-parents>Panel,StackPanel,Grid,DockPanel,Canvas</allowed-parents>
      <allowed-children>none</allowed-children>
      <container>false</container>
    </constraints>
    <attributes>
      <attribute name="selected-date" type="date" default="null" />
      <attribute name="display-date" type="date" default="today" />
      <attribute name="first-day-of-week" type="enum" values="Sunday,Monday,Tuesday,Wednesday,Thursday,Friday,Saturday" default="Sunday" />
      <attribute name="is-drop-down-open" type="bool" default="false" />
      <attribute name="placeholder-text" type="string" default="" />
      <attribute name="watermark" type="string" default="" />
    </attributes>
    <behavior>
      <event name="selected-date-changed" />
      <event name="calendar-opened" />
      <event name="calendar-closed" />
      <event name="date-validation-error" />
    </behavior>
  </control>
  
  <control name="TimePicker" type="input" category="avalonia-input">
    <constraints>
      <allowed-parents>Panel,StackPanel,Grid,DockPanel,Canvas</allowed-parents>
      <allowed-children>none</allowed-children>
      <container>false</container>
    </constraints>
    <attributes>
      <attribute name="selected-time" type="timespan" default="null" />
      <attribute name="minute-increment" type="int" default="1" min="1" max="30" />
      <attribute name="clock-identifier" type="string" default="12HourClock" />
    </attributes>
    <behavior>
      <event name="selected-time-changed" />
    </behavior>
  </control>
  
  <!-- Display Controls -->
  <control name="AvaloniaLabel" type="display" category="avalonia-display" inherits="Label">
    <constraints>
      <allowed-parents>Panel,StackPanel,Grid,DockPanel,Canvas</allowed-parents>
      <allowed-children>any-content</allowed-children>
      <container>true</container>
    </constraints>
    <attributes>
      <attribute name="target" type="string" default="" />
    </attributes>
  </control>
  
  <control name="TextBlock" type="display" category="avalonia-display">
    <constraints>
      <allowed-parents>Panel,StackPanel,Grid,DockPanel,Canvas,ScrollViewer</allowed-parents>
      <allowed-children>Inline</allowed-children>
      <container>true</container>
    </constraints>
    <attributes>
      <attribute name="text" type="string" default="" />
      <attribute name="font-family" type="string" default="Default" />
      <attribute name="font-size" type="double" default="12" min="1" max="100" />
      <attribute name="font-weight" type="enum" values="Thin,ExtraLight,Light,Normal,Medium,SemiBold,Bold,ExtraBold,Black,ExtraBlack" default="Normal" />
      <attribute name="font-style" type="enum" values="Normal,Italic,Oblique" default="Normal" />
      <attribute name="text-alignment" type="enum" values="Left,Center,Right,Justify" default="Left" />
      <attribute name="text-wrapping" type="enum" values="NoWrap,Wrap" default="NoWrap" />
      <attribute name="text-trimming" type="enum" values="None,CharacterEllipsis,WordEllipsis" default="None" />
      <attribute name="text-decoration" type="enum" values="None,Underline,Strikethrough,Baseline,OverLine" default="None" />
      <attribute name="line-height" type="double" default="NaN" min="0" />
      <attribute name="max-lines" type="int" default="0" min="0" />
    </attributes>
  </control>
  
  <control name="Image" type="display" category="avalonia-display">
    <constraints>
      <allowed-parents>Panel,StackPanel,Grid,DockPanel,Canvas</allowed-parents>
      <allowed-children>none</allowed-children>
      <container>false</container>
    </constraints>
    <attributes>
      <attribute name="source" type="string" default="" />
      <attribute name="stretch" type="enum" values="None,Fill,Uniform,UniformToFill" default="Uniform" />
      <attribute name="stretch-direction" type="enum" values="UpOnly,DownOnly,Both" default="Both" />
    </attributes>
  </control>
  
  <control name="ProgressBar" type="display" category="avalonia-display">
    <constraints>
      <allowed-parents>Panel,StackPanel,Grid,DockPanel,Canvas</allowed-parents>
      <allowed-children>none</allowed-children>
      <container>false</container>
    </constraints>
    <attributes>
      <attribute name="value" type="double" default="0" />
      <attribute name="minimum" type="double" default="0" />
      <attribute name="maximum" type="double" default="100" />
      <attribute name="is-indeterminate" type="bool" default="false" />
      <attribute name="orientation" type="enum" values="Horizontal,Vertical" default="Horizontal" />
      <attribute name="show-progress-text" type="bool" default="false" />
    </attributes>
  </control>
  
  <!-- Data Controls -->
  <control name="AvaloniaListView" type="data" category="avalonia-data" inherits="ListView">
    <constraints>
      <allowed-parents>Panel,StackPanel,Grid,DockPanel,Canvas,ScrollViewer</allowed-parents>
      <allowed-children>ListViewItem</allowed-children>
      <container>true</container>
    </constraints>
    <attributes>
      <attribute name="selection-mode" type="enum" values="Single,Multiple,Extended,Toggle" default="Single" />
    </attributes>
    <structure>
      <view>
        <grid-view>
          <columns>
            <grid-view-column header="" display-member-binding="" width="auto" />
          </columns>
        </grid-view>
      </view>
    </structure>
  </control>
  
  <control name="DataGrid" type="data" category="avalonia-data">
    <constraints>
      <allowed-parents>Panel,StackPanel,Grid,DockPanel,Canvas</allowed-parents>
      <allowed-children>DataGridColumn</allowed-children>
      <container>true</container>
      <requires-structure>columns</requires-structure>
    </constraints>
    <attributes>
      <attribute name="items-source" type="object" default="null" />
      <attribute name="selected-item" type="object" default="null" />
      <attribute name="selected-index" type="int" default="-1" />
      <attribute name="can-user-resize-columns" type="bool" default="true" />
      <attribute name="can-user-sort-columns" type="bool" default="true" />
      <attribute name="can-user-reorder-columns" type="bool" default="true" />
      <attribute name="row-background" type="brush" default="Transparent" />
      <attribute name="alternating-row-background" type="brush" default="Transparent" />
      <attribute name="selection-mode" type="enum" values="Single,Extended" default="Extended" />
      <attribute name="grid-lines-visibility" type="enum" values="None,Horizontal,Vertical,All" default="All" />
      <attribute name="headers-visibility" type="enum" values="None,Column,Row,All" default="Column" />
      <attribute name="auto-generate-columns" type="bool" default="true" />
      <attribute name="is-read-only" type="bool" default="false" />
    </attributes>
    <behavior>
      <event name="selection-changed" />
      <event name="current-cell-changed" />
      <event name="row-edit-ending" />
      <event name="row-edit-ended" />
      <event name="cell-edit-ending" />
      <event name="cell-edit-ended" />
      <event name="begin-edit" />
      <event name="prepare-cell-for-edit" />
      <event name="column-reordering" />
      <event name="column-reordered" />
      <event name="sorting" />
    </behavior>
    <structure>
      <columns min-count="0" max-count="50">
        <DataGridTextColumn header="" binding="" width="*" is-read-only="false" />
        <DataGridCheckBoxColumn header="" binding="" width="auto" is-read-only="false" />
        <DataGridComboBoxColumn header="" binding="" width="*" is-read-only="false" />
        <DataGridTemplateColumn header="" width="*" is-read-only="false" />
      </columns>
    </structure>
  </control>
  
  <control name="AvaloniaTreeView" type="data" category="avalonia-data" inherits="TreeView">
    <constraints>
      <allowed-parents>Panel,StackPanel,Grid,DockPanel,Canvas</allowed-parents>
      <allowed-children>TreeViewItem</allowed-children>
      <container>true</container>
    </constraints>
    <attributes>
      <attribute name="selected-item" type="object" default="null" />
      <attribute name="auto-scroll-to-selected-item" type="bool" default="true" />
    </attributes>
    <behavior>
      <event name="selection-changed" />
    </behavior>
    <structure>
      <items>
        <TreeViewItem header="" is-expanded="false" is-selected="false">
          <items>
            <!-- Recursive TreeViewItem structure -->
          </items>
        </TreeViewItem>
      </items>
    </structure>
  </control>
  
  <control name="ListBox" type="data" category="avalonia-data">
    <constraints>
      <allowed-parents>Panel,StackPanel,Grid,DockPanel,Canvas</allowed-parents>
      <allowed-children>ListBoxItem</allowed-children>
      <container>true</container>
    </constraints>
    <attributes>
      <attribute name="selected-item" type="object" default="null" />
      <attribute name="selected-index" type="int" default="-1" />
      <attribute name="selection-mode" type="enum" values="Single,Multiple,Extended,Toggle" default="Single" />
    </attributes>
    <behavior>
      <event name="selection-changed" />
    </behavior>
    <structure>
      <items>
        <ListBoxItem content="" is-selected="false" />
      </items>
    </structure>
  </control>
  
  <!-- Container and Decoration Controls -->
  <control name="Border" type="container" category="avalonia-decoration">
    <constraints>
      <allowed-parents>Panel,StackPanel,Grid,DockPanel,Canvas</allowed-parents>
      <allowed-children>single-child</allowed-children>
      <container>true</container>
      <max-children>1</max-children>
    </constraints>
    <attributes>
      <attribute name="border-brush" type="brush" default="Black" />
      <attribute name="border-thickness" type="thickness" default="0" />
      <attribute name="corner-radius" type="corner-radius" default="0" />
      <attribute name="background" type="brush" default="Transparent" />
      <attribute name="padding" type="thickness" default="0" />
    </attributes>
  </control>
  
  <control name="ScrollViewer" type="container" category="avalonia-container">
    <constraints>
      <allowed-parents>Panel,StackPanel,Grid,DockPanel,Canvas,Border</allowed-parents>
      <allowed-children>single-child</allowed-children>
      <container>true</container>
      <max-children>1</max-children>
    </constraints>
    <attributes>
      <attribute name="horizontal-scroll-bar-visibility" type="enum" values="Disabled,Auto,Hidden,Visible" default="Disabled" />
      <attribute name="vertical-scroll-bar-visibility" type="enum" values="Disabled,Auto,Hidden,Visible" default="Auto" />
      <attribute name="zoom-mode" type="enum" values="Disabled,Enabled" default="Disabled" />
      <attribute name="horizontal-snap-points-type" type="enum" values="None,Optional,Mandatory,OptionalSingle,MandatorySingle" default="None" />
      <attribute name="vertical-snap-points-type" type="enum" values="None,Optional,Mandatory,OptionalSingle,MandatorySingle" default="None" />
      <attribute name="is-scroll-chaining-enabled" type="bool" default="true" />
    </attributes>
    <behavior>
      <event name="scroll-changed" />
    </behavior>
  </control>
  
  <control name="Expander" type="container" category="avalonia-container">
    <constraints>
      <allowed-parents>Panel,StackPanel,Grid,DockPanel,Canvas</allowed-parents>
      <allowed-children>single-child</allowed-children>
      <container>true</container>
      <max-children>1</max-children>
    </constraints>
    <attributes>
      <attribute name="is-expanded" type="bool" default="false" />
      <attribute name="expand-direction" type="enum" values="Down,Up,Left,Right" default="Down" />
      <attribute name="header" type="object" default="null" />
    </attributes>
    <behavior>
      <event name="expanded" />
      <event name="collapsed" />
    </behavior>
  </control>
  
  <control name="TabControl" type="container" category="avalonia-container">
    <constraints>
      <allowed-parents>Panel,StackPanel,Grid,DockPanel,Canvas</allowed-parents>
      <allowed-children>TabItem</allowed-children>
      <container>true</container>
      <requires-structure>tabs</requires-structure>
    </constraints>
    <attributes>
      <attribute name="selected-index" type="int" default="0" min="0" />
      <attribute name="selected-item" type="object" default="null" />
      <attribute name="tab-strip-placement" type="enum" values="Top,Bottom,Left,Right" default="Top" />
    </attributes>
    <behavior>
      <event name="selection-changed" />
    </behavior>
    <structure>
      <tabs min-count="1" max-count="20">
        <TabItem header="" is-selected="false">
          <!-- Tab content -->
        </TabItem>
      </tabs>
    </structure>
  </control>
  
  <control name="SplitView" type="container" category="avalonia-container">
    <constraints>
      <allowed-parents>Panel,StackPanel,Grid,DockPanel,Canvas</allowed-parents>
      <allowed-children>pane-content</allowed-children>
      <container>true</container>
      <max-children>2</max-children>
    </constraints>
    <attributes>
      <attribute name="is-pane-open" type="bool" default="false" />
      <attribute name="display-mode" type="enum" values="Overlay,Inline,CompactOverlay,CompactInline" default="Overlay" />
      <attribute name="open-pane-length" type="double" default="320" min="0" />
      <attribute name="compact-pane-length" type="double" default="48" min="0" />
      <attribute name="pane-placement" type="enum" values="Left,Right" default="Left" />
    </attributes>
    <behavior>
      <event name="pane-opened" />
      <event name="pane-closed" />
    </behavior>
    <structure>
      <pane>
        <!-- Pane content -->
      </pane>
      <content>
        <!-- Main content -->
      </content>
    </structure>
  </control>
  
  <!-- Specialized Controls -->
  <control name="MenuBar" type="navigation" category="avalonia-navigation">
    <constraints>
      <allowed-parents>Panel,StackPanel,Grid,DockPanel</allowed-parents>
      <allowed-children>NativeMenuItem</allowed-children>
      <container>true</container>
      <requires-structure>menu-items</requires-structure>
    </constraints>
    <structure>
      <menu-items min-count="1" max-count="20">
        <NativeMenuItem header="" command="" input-gesture="">
          <menu-items>
            <!-- Nested menu items -->
          </menu-items>
        </NativeMenuItem>
      </menu-items>
    </structure>
  </control>
  
  <control name="ContextMenu" type="navigation" category="avalonia-navigation">
    <constraints>
      <allowed-parents>any-control</allowed-parents>
      <allowed-children>MenuItem</allowed-children>
      <container>true</container>
      <requires-structure>menu-items</requires-structure>
    </constraints>
    <attributes>
      <attribute name="placement-mode" type="enum" values="Bottom,Right,Mouse,Relative,BottomEdgeAlignedLeft,BottomEdgeAlignedRight,TopEdgeAlignedLeft,TopEdgeAlignedRight,LeftEdgeAlignedTop,LeftEdgeAlignedBottom,RightEdgeAlignedTop,RightEdgeAlignedBottom" default="Mouse" />
      <attribute name="placement-target" type="object" default="null" />
    </attributes>
    <behavior>
      <event name="opened" />
      <event name="closed" />
    </behavior>
    <structure>
      <menu-items min-count="1" max-count="50">
        <MenuItem header="" command="" input-gesture="" is-checkable="false" is-checked="false">
          <menu-items>
            <!-- Nested menu items -->
          </menu-items>
        </MenuItem>
      </menu-items>
    </structure>
  </control>
  
  <control name="ToolTip" type="display" category="avalonia-decoration">
    <constraints>
      <allowed-parents>any-control</allowed-parents>
      <allowed-children>any-content</allowed-children>
      <container>true</container>
      <max-children>1</max-children>
    </constraints>
    <attributes>
      <attribute name="tip" type="object" default="null" />
      <attribute name="placement" type="enum" values="Top,Bottom,Left,Right,Pointer,TopEdgeAlignedLeft,TopEdgeAlignedRight,BottomEdgeAlignedLeft,BottomEdgeAlignedRight,LeftEdgeAlignedTop,LeftEdgeAlignedBottom,RightEdgeAlignedTop,RightEdgeAlignedBottom" default="Top" />
      <attribute name="horizontal-offset" type="double" default="0" />
      <attribute name="vertical-offset" type="double" default="0" />
      <attribute name="show-delay" type="int" default="400" min="0" max="5000" />
      <attribute name="show-on-disabled" type="bool" default="true" />
    </attributes>
    <behavior>
      <event name="tip-opened" />
      <event name="tip-closed" />
    </behavior>
  </control>
  
  <control name="FlyoutBase" type="container" category="avalonia-popup">
    <constraints>
      <allowed-parents>any-control</allowed-parents>
      <allowed-children>any-content</allowed-children>
      <container>true</container>
    </constraints>
    <attributes>
      <attribute name="placement" type="enum" values="Top,Bottom,Left,Right,TopEdgeAlignedLeft,TopEdgeAlignedRight,BottomEdgeAlignedLeft,BottomEdgeAlignedRight,LeftEdgeAlignedTop,LeftEdgeAlignedBottom,RightEdgeAlignedTop,RightEdgeAlignedBottom" default="Bottom" />
      <attribute name="show-mode" type="enum" values="Standard,Transient,TransientWithDismissOnPointerMoveAway" default="Standard" />
    </attributes>
    <behavior>
      <event name="opened" />
      <event name="closed" />
    </behavior>
  </control>
  
  <control name="Window" type="container" category="avalonia-window">
    <constraints>
      <allowed-parents>none</allowed-parents>
      <allowed-children>single-child</allowed-children>
      <container>true</container>
      <max-children>1</max-children>
    </constraints>
    <attributes>
      <attribute name="title" type="string" default="" />
      <attribute name="width" type="double" default="800" min="200" max="4000" />
      <attribute name="height" type="double" default="600" min="150" max="3000" />
      <attribute name="min-width" type="double" default="0" min="0" />
      <attribute name="min-height" type="double" default="0" min="0" />
      <attribute name="max-width" type="double" default="Infinity" />
      <attribute name="max-height" type="double" default="Infinity" />
      <attribute name="can-resize" type="bool" default="true" />
      <attribute name="show-in-taskbar" type="bool" default="true" />
      <attribute name="topmost" type="bool" default="false" />
      <attribute name="window-state" type="enum" values="Normal,Minimized,Maximized,FullScreen" default="Normal" />
      <attribute name="window-startup-location" type="enum" values="Manual,CenterScreen,CenterOwner" default="Manual" />
      <attribute name="system-decorations" type="enum" values="Full,BorderOnly,None" default="Full" />
      <attribute name="extend-client-area-to-decorations-hint" type="bool" default="false" />
      <attribute name="extend-client-area-chrome-hints" type="enum" values="Default,PreferSystemChrome,PreferClientChrome,NoChrome" default="Default" />
      <attribute name="extend-client-area-title-bar-height-hint" type="double" default="-1" />
    </attributes>
    <behavior>
      <event name="activated" />
      <event name="deactivated" />
      <event name="closing" />
      <event name="closed" />
      <event name="opened" />
      <event name="position-changed" />
      <event name="resize-started" />
      <event name="resize-ended" />
      <event name="window-state-changed" />
    </behavior>
  </control>
  
  <control name="UserControl" type="container" category="avalonia-container">
    <constraints>
      <allowed-parents>Panel,StackPanel,Grid,DockPanel,Canvas,Border,ScrollViewer</allowed-parents>
      <allowed-children>single-child</allowed-children>
      <container>true</container>
      <max-children>1</max-children>
    </constraints>
    <attributes>
      <attribute name="content" type="object" default="null" />
    </attributes>
  </control>
  
  <!-- Media Controls -->
  <control name="MediaElement" type="media" category="avalonia-media">
    <constraints>
      <allowed-parents>Panel,StackPanel,Grid,DockPanel,Canvas</allowed-parents>
      <allowed-children>none</allowed-children>
      <container>false</container>
    </constraints>
    <attributes>
      <attribute name="source" type="string" default="" />
      <attribute name="volume" type="double" default="0.5" min="0" max="1" />
      <attribute name="is-muted" type="bool" default="false" />
      <attribute name="auto-play" type="bool" default="false" />
      <attribute name="stretch" type="enum" values="None,Fill,Uniform,UniformToFill" default="Uniform" />
      <attribute name="position" type="timespan" default="00:00:00" />
    </attributes>
    <behavior>
      <event name="media-opened" />
      <event name="media-ended" />
      <event name="media-failed" />
      <event name="position-changed" />
      <event name="buffering-started" />
      <event name="buffering-ended" />
    </behavior>
  </control>
  
  <!-- Advanced Input Controls -->
  <control name="MaskedTextBox" type="input" category="avalonia-input">
    <constraints>
      <allowed-parents>Panel,StackPanel,Grid,DockPanel,Canvas</allowed-parents>
      <allowed-children>none</allowed-children>
      <container>false</container>
    </constraints>
    <attributes>
      <attribute name="mask" type="string" default="" />
      <attribute name="prompt-char" type="char" default="_" />
      <attribute name="culture" type="string" default="en-US" />
      <attribute name="ascii-only" type="bool" default="false" />
      <attribute name="reset-on-prompt" type="bool" default="true" />
      <attribute name="reset-on-space" type="bool" default="true" />
      <attribute name="skip-literals" type="bool" default="true" />
    </attributes>
    <behavior>
      <event name="mask-input-rejected" />
      <event name="text-mask-format-changed" />
    </behavior>
  </control>
  
  <control name="ColorPicker" type="input" category="avalonia-input">
    <constraints>
      <allowed-parents>Panel,StackPanel,Grid,DockPanel,Canvas</allowed-parents>
      <allowed-children>none</allowed-children>
      <container>false</container>
    </constraints>
    <attributes>
      <attribute name="color" type="color" default="#FFFFFF" />
      <attribute name="is-alpha-enabled" type="bool" default="true" />
      <attribute name="is-color-slider-visible" type="bool" default="true" />
      <attribute name="is-color-palette-visible" type="bool" default="true" />
      <attribute name="is-hex-input-visible" type="bool" default="true" />
      <attribute name="palette-column-count" type="int" default="10" min="1" max="20" />
    </attributes>
    <behavior>
      <event name="color-changed" />
    </behavior>
  </control>
  
  <!-- Drawing and Canvas Controls -->
  <control name="PathIcon" type="display" category="avalonia-graphics">
    <constraints>
      <allowed-parents>Panel,StackPanel,Grid,DockPanel,Canvas,Button</allowed-parents>
      <allowed-children>none</allowed-children>
      <container>false</container>
    </constraints>
    <attributes>
      <attribute name="data" type="geometry" default="" />
      <attribute name="foreground" type="brush" default="Black" />
    </attributes>
  </control>
  
  <control name="Viewbox" type="container" category="avalonia-layout">
    <constraints>
      <allowed-parents>Panel,StackPanel,Grid,DockPanel,Canvas</allowed-parents>
      <allowed-children>single-child</allowed-children>
      <container>true</container>
      <max-children>1</max-children>
    </constraints>
    <attributes>
      <attribute name="stretch" type="enum" values="None,Fill,Uniform,UniformToFill" default="Uniform" />
      <attribute name="stretch-direction" type="enum" values="UpOnly,DownOnly,Both" default="Both" />
    </attributes>
  </control>
  
  <!-- Notification Controls -->
  <control name="NotificationCard" type="display" category="avalonia-notification">
    <constraints>
      <allowed-parents>Panel,StackPanel,Grid</allowed-parents>
      <allowed-children>any-content</allowed-children>
      <container>true</container>
    </constraints>
    <attributes>
      <attribute name="notification-type" type="enum" values="Information,Success,Warning,Error" default="Information" />
      <attribute name="is-closable" type="bool" default="true" />
      <attribute name="close-on-click" type="bool" default="false" />
    </attributes>
    <behavior>
      <event name="closed" />
      <event name="closing" />
    </behavior>
  </control>
  
  <!-- Custom Structures and Patterns -->
  <structure name="AvaloniaFormField" type="pattern" category="avalonia-composite" inherits="FormField">
    <constraints>
      <allowed-parents>StackPanel,Grid,UniformGrid</allowed-parents>
      <allowed-children>Label,AvaloniaTextBox,AvaloniaComboBox,CheckBox,NumericUpDown</allowed-children>
      <container>true</container>
      <required-slots>input</required-slots>
    </constraints>
    <attributes>
      <attribute name="label-text" type="string" required="true" />
      <attribute name="required" type="bool" default="false" />
      <attribute name="validation-message" type="string" default="" />
      <attribute name="help-text" type="string" default="" />
      <attribute name="label-width" type="double" default="120" min="50" max="300" />
    </attributes>
    <template>
      <Grid name="fieldContainer">
        <grid-definitions>
          <column-definitions>
            <column-definition width="{label-width}" />
            <column-definition width="*" />
          </column-definitions>
          <row-definitions>
            <row-definition height="Auto" />
            <row-definition height="Auto" />
          </row-definitions>
        </grid-definitions>
        
        <AvaloniaLabel name="fieldLabel" text="{label-text}" grid-column="0" grid-row="0" />
        <slot name="input" allowed-controls="AvaloniaTextBox,AvaloniaComboBox,CheckBox,NumericUpDown" required="true" grid-column="1" grid-row="0" />
        
        <TextBlock name="helpText" text="{help-text}" grid-column="1" grid-row="1" 
                   font-size="11" foreground="Gray" visible="{help-text != ''}" />
        <TextBlock name="validationLabel" text="{validation-message}" grid-column="1" grid-row="1"
                   visible="false" foreground="Red" font-size="11" />
      </Grid>
    </template>
  </structure>
  
  <structure name="AvaloniaButtonBar" type="pattern" category="avalonia-composite">
    <constraints>
      <allowed-parents>Panel,StackPanel,Grid,DockPanel</allowed-parents>
      <allowed-children>AvaloniaButton</allowed-children>
      <container>true</container>
      <max-children>10</max-children>
    </constraints>
    <attributes>
      <attribute name="alignment" type="enum" values="Left,Center,Right,Stretch" default="Right" />
      <attribute name="spacing" type="double" default="5" min="0" max="20" />
      <attribute name="orientation" type="enum" values="Horizontal,Vertical" default="Horizontal" />
    </attributes>
    <template>
      <StackPanel name="buttonContainer" orientation="{orientation}" spacing="{spacing}">
        <slot name="buttons" allowed-controls="AvaloniaButton" />
      </StackPanel>
    </template>
  </structure>
  
  <structure name="AvaloniaToolbar" type="pattern" category="avalonia-composite">
    <constraints>
      <allowed-parents>DockPanel,Grid,StackPanel</allowed-parents>
      <allowed-children>AvaloniaButton,Separator</allowed-children>
      <container>true</container>
    </constraints>
    <attributes>
      <attribute name="orientation" type="enum" values="Horizontal,Vertical" default="Horizontal" />
      <attribute name="band" type="int" default="0" min="0" max="10" />
      <attribute name="band-index" type="int" default="0" min="0" max="100" />
    </attributes>
    <template>
      <Border name="toolbarBorder" background="LightGray" border-thickness="0,0,0,1" border-brush="Gray">
        <StackPanel name="toolbarPanel" orientation="{orientation}" margin="2">
          <slot name="toolbar-items" allowed-controls="AvaloniaButton,Separator" />
        </StackPanel>
      </Border>
    </template>
  </structure>
  
  <structure name="AvaloniaStatusBar" type="pattern" category="avalonia-composite">
    <constraints>
      <allowed-parents>DockPanel,Grid</allowed-parents>
      <allowed-children>TextBlock,ProgressBar,Separator</allowed-children>
      <container>true</container>
    </constraints>
    <attributes>
      <attribute name="height" type="double" default="23" min="20" max="50" />
    </attributes>
    <template>
      <Border name="statusBorder" background="LightGray" border-thickness="0,1,0,0" border-brush="Gray" height="{height}">
        <DockPanel name="statusPanel" last-child-fill="true">
          <slot name="status-items" allowed-controls="TextBlock,ProgressBar,Separator" />
        </DockPanel>
      </Border>
    </template>
  </structure>
  
  <wireframe name="AvaloniaMainWindow" type="base-layout">
    <description>Standard Avalonia application window with menu, toolbar, status bar, and content area</description>
    <template>
      <DockPanel name="mainContainer">
        <slot name="menu-bar" dock="Top" default="true">
          <MenuBar name="mainMenu">
            <slot name="menu-items" />
          </MenuBar>
        </slot>
        
        <slot name="toolbar" dock="Top" default="true">
          <AvaloniaToolbar name="mainToolbar">
            <slot name="toolbar-items" />
          </AvaloniaToolbar>
        </slot>
        
        <slot name="status-bar" dock="Bottom" default="true">
          <AvaloniaStatusBar name="mainStatusBar">
            <slot name="status-items" />
          </AvaloniaStatusBar>
        </slot>
        
        <slot name="main-content" required="true" />
      </DockPanel>
    </template>
  </wireframe>
  
  <wireframe name="AvaloniaDialog" type="base-layout">
    <description>Standard Avalonia dialog layout with content and button areas</description>
    <template>
      <Border name="dialogBorder" background="White" border-brush="Gray" border-thickness="1" corner-radius="4">
        <DockPanel name="dialogContainer" margin="10">
          <slot name="dialog-buttons" dock="Bottom" default="true">
            <AvaloniaButtonBar name="dialogButtons" alignment="Right" margin="0,10,0,0">
              <AvaloniaButton name="okButton" text="OK" is-default="true" />
              <AvaloniaButton name="cancelButton" text="Cancel" is-cancel="true" />
            </AvaloniaButtonBar>
          </slot>
          
          <slot name="dialog-content" required="true" />
        </DockPanel>
      </Border>
    </template>
  </wireframe>
  
</patterns>