File size: 4,764 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 | // Copyright (c) Microsoft Corporation.
// Licensed under the MIT License.
using System.Windows;
using System.Windows.Automation;
using System.Windows.Automation.Peers;
using System.Windows.Controls;
using System.Windows.Controls.Primitives;
using System.Windows.Input;
namespace Microsoft.Management.UI.Internal
{
/// <summary>
/// Represents a toggle button used to expand or collapse elements.
/// </summary>
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.MSInternal", "CA903:InternalNamespaceShouldNotContainPublicTypes")]
public partial class ExpanderButton : ToggleButton
{
/// <summary>
/// Tooltip to show to expand.
/// </summary>
protected virtual string ExpandToolTip
{
get { return XamlLocalizableResources.AutoResXGen_ManagementList2_ToolTip_32; }
}
/// <summary>
/// Tooltip to show to collapse.
/// </summary>
protected virtual string CollapseToolTip
{
get { return XamlLocalizableResources.CollapsingTabControl_ExpandButton_AutomationName; }
}
/// <summary>
/// Initializes a new instance of the <see cref="ExpanderButton" /> class.
/// </summary>
public ExpanderButton()
{
// This constructor intentionally left blank
}
/// <summary>
/// Invoked whenever the effective value of any dependency property on this <see cref="ExpanderButton"/> has been updated. The specific dependency property that changed is reported in the arguments parameter. Overrides <see cref="FrameworkElement.OnPropertyChanged"/>.
/// </summary>
/// <param name="e">The event data that describes the property that changed, as well as old and new values.</param>
protected override void OnPropertyChanged(DependencyPropertyChangedEventArgs e)
{
base.OnPropertyChanged(e);
if (e.Property == ExpanderButton.IsCheckedProperty)
{
this.OnIsCheckedChanged(e);
}
}
/// <summary>
/// Called when the <see cref="ToggleButton.IsChecked"/> property changes.
/// </summary>
/// <param name="args">The event data that describes the property that changed, as well as old and new values.</param>
protected void OnIsCheckedChanged(DependencyPropertyChangedEventArgs args)
{
if (AutomationPeer.ListenerExists(AutomationEvents.PropertyChanged))
{
var peer = UIElementAutomationPeer.CreatePeerForElement(this);
if (peer != null)
{
var oldValue = (bool?)args.OldValue;
var newValue = (bool?)args.NewValue;
peer.RaisePropertyChangedEvent(
ExpandCollapsePatternIdentifiers.ExpandCollapseStateProperty,
(oldValue == true) ? ExpandCollapseState.Expanded : ExpandCollapseState.Collapsed,
(newValue == true) ? ExpandCollapseState.Expanded : ExpandCollapseState.Collapsed);
}
}
SetToolTip();
ToolTip toolTip = (ToolTip)this.ToolTip;
if (toolTip.IsOpen)
{
// need to reset so content changes if already open
toolTip.IsOpen = false;
toolTip.IsOpen = true;
}
}
/// <summary>
/// Called when it has keyboard focus.
/// </summary>
/// <param name="args">The event data that describes getting keyboard focus.</param>
protected override void OnGotKeyboardFocus(KeyboardFocusChangedEventArgs args)
{
SetToolTip();
((ToolTip)this.ToolTip).IsOpen = true;
}
/// <summary>
/// Called when it lost keyboard focus.
/// </summary>
/// <param name="args">The event data that describes losing keyboard focus.</param>
protected override void OnLostKeyboardFocus(KeyboardFocusChangedEventArgs args)
{
if (this.ToolTip is ToolTip toolTip)
{
toolTip.IsOpen = false;
}
}
private void SetToolTip()
{
ToolTip toolTip;
if (this.ToolTip is ToolTip)
{
toolTip = (ToolTip)this.ToolTip;
}
else
{
toolTip = new ToolTip();
}
toolTip.Content = (this.IsChecked == true) ? CollapseToolTip : ExpandToolTip;
toolTip.PlacementTarget = this;
toolTip.Placement = PlacementMode.Bottom;
this.ToolTip = toolTip;
}
}
}
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