File size: 3,966 Bytes
8c763fb | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 | // Copyright (c) Microsoft Corporation.
// Licensed under the MIT License.
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Diagnostics.CodeAnalysis;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Controls.Primitives;
using System.Windows.Data;
using System.Windows.Input;
using System.Windows.Threading;
namespace Microsoft.Management.UI.Internal
{
/// <summary>
/// Implements a re-usable base component useful for showing
/// Picker-like controls.
/// </summary>
[SuppressMessage("Microsoft.MSInternal", "CA903:InternalNamespaceShouldNotContainPublicTypes")]
public partial class PickerBase : HeaderedContentControl
{
/// <summary>
/// Creates a new instance of the PickerBase class.
/// </summary>
public PickerBase()
{
// empty
}
partial void OnCloseDropDownExecutedImplementation(ExecutedRoutedEventArgs e)
{
this.IsOpen = false;
}
#region DropDownButtonTemplate Changed
partial void OnDropDownButtonTemplateChangedImplementation(PropertyChangedEventArgs<ControlTemplate> e)
{
this.ApplyDropDownButtonTemplate();
}
private void ApplyDropDownButtonTemplate()
{
if (!this.IsLoaded)
{
this.ApplyTemplate();
this.Loaded += this.PickerBase_Loaded_ApplyDropDownButtonTemplate;
return;
}
if (this.DropDownButtonTemplate != null && !ReferenceEquals(this.dropDownButton.Template, this.DropDownButtonTemplate))
{
this.dropDownButton.Template = this.DropDownButtonTemplate;
}
}
private void PickerBase_Loaded_ApplyDropDownButtonTemplate(object sender, RoutedEventArgs e)
{
this.Loaded -= this.PickerBase_Loaded_ApplyDropDownButtonTemplate;
this.ApplyDropDownButtonTemplate();
}
#endregion DropDownButtonTemplate Changed
#region DropDown IsOpen Handlers
private void DropDown_Opened(object sender, EventArgs e)
{
this.FocusDropDown();
}
private void FocusDropDown()
{
if (!this.dropDown.IsLoaded)
{
this.dropDown.Loaded += this.DropDown_Loaded_FocusDropDown;
}
if (this.dropDown.Child != null && !this.dropDown.IsAncestorOf((DependencyObject)Keyboard.FocusedElement))
{
this.dropDown.Child.MoveFocus(new TraversalRequest(FocusNavigationDirection.First));
}
}
private void DropDown_Loaded_FocusDropDown(object sender, RoutedEventArgs e)
{
this.Loaded -= this.DropDown_Loaded_FocusDropDown;
this.FocusDropDown();
}
private void DropDown_Closed(object sender, EventArgs e)
{
if (this.dropDown.IsKeyboardFocusWithin || Keyboard.FocusedElement == null)
{
this.dropDownButton.Focus();
}
}
#endregion DropDown IsOpen Handlers
#region Apply Template
partial void PostOnApplyTemplate()
{
this.AttachToVisualTree();
this.ApplyDropDownButtonTemplate();
}
partial void PreOnApplyTemplate()
{
this.DetachFromVisualTree();
}
private void AttachToVisualTree()
{
this.dropDown.Opened += this.DropDown_Opened;
this.dropDown.Closed += this.DropDown_Closed;
}
private void DetachFromVisualTree()
{
if (this.dropDown != null)
{
this.dropDown.Opened -= this.DropDown_Opened;
this.dropDown.Closed -= this.DropDown_Closed;
}
}
#endregion Apply Template
}
}
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