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The new PopupAssist allows to have a popup that follows your mouse #101

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The new PopupAssist allows to have a popup that follows your mouse #101

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d8fa2c2
Introduce Automoving Popup
timunie Dec 22, 2019
1c3083c
Fix: Automove got not applied on first run
timunie Dec 22, 2019
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31 changes: 31 additions & 0 deletions src/ControlzEx.Showcase/MainWindow.xaml
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Original file line number Diff line number Diff line change
Expand Up @@ -208,6 +208,37 @@
</ToolTip>
</Button.ToolTip>
</Button>

<ToggleButton x:Name="Tgl_AutoMovingPopup"
MinWidth="100"
Margin="4"
Content="Show Auto Moving Popup" />
<Popup controlzEx:PopupAssist.AutoMove="True"
IsOpen="{Binding ElementName=Tgl_AutoMovingPopup, Path=IsChecked}"
Placement="Relative"
PlacementTarget="{Binding ElementName=Window}">
<Grid>
<Border Background="Gray"
BorderBrush="Black"
BorderThickness="1"
Opacity="0.9"
SnapsToDevicePixels="True" />
<StackPanel Orientation="Vertical">
<TextBlock Margin="5"
FontSize="22"
Foreground="WhiteSmoke"
Text="PopupHelper AutoMove sample"
TextOptions.TextFormattingMode="Display"
TextOptions.TextRenderingMode="ClearType" />
<Viewbox Width="64" Height="64">
<Canvas Width="24" Height="24">
<Path Data="M19,10C19,11.38 16.88,12.5 15.5,12.5C14.12,12.5 12.75,11.38 12.75,10H11.25C11.25,11.38 9.88,12.5 8.5,12.5C7.12,12.5 5,11.38 5,10H4.25C4.09,10.64 4,11.31 4,12A8,8 0 0,0 12,20A8,8 0 0,0 20,12C20,11.31 19.91,10.64 19.75,10H19M12,4C9.04,4 6.45,5.61 5.07,8H18.93C17.55,5.61 14.96,4 12,4M22,12A10,10 0 0,1 12,22A10,10 0 0,1 2,12A10,10 0 0,1 12,2A10,10 0 0,1 22,12M12,17.23C10.25,17.23 8.71,16.5 7.81,15.42L9.23,14C9.68,14.72 10.75,15.23 12,15.23C13.25,15.23 14.32,14.72 14.77,14L16.19,15.42C15.29,16.5 13.75,17.23 12,17.23Z" Fill="DarkOrange" />
</Canvas>
</Viewbox>
</StackPanel>
</Grid>
</Popup>

</WrapPanel>
</GroupBox>

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240 changes: 240 additions & 0 deletions src/ControlzEx/PopupAssist.cs
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Original file line number Diff line number Diff line change
@@ -0,0 +1,240 @@
using System;
using System.Diagnostics;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Controls.Primitives;
using System.Windows.Input;

namespace ControlzEx
{
using ControlzEx.Standard;

public static class PopupAssist
{
public static readonly DependencyProperty AutoMoveProperty
= DependencyProperty.RegisterAttached("AutoMove",
typeof(bool),
typeof(PopupAssist),
new FrameworkPropertyMetadata(false, OnAutoMoveChanged));

/// <summary>
/// Indicates whether a popup should follow the mouse cursor.
/// </summary>
[AttachedPropertyBrowsableForType(typeof(Popup))]
public static bool GetAutoMove(Popup element)
{
return (bool)element.GetValue(AutoMoveProperty);
}

/// <summary>
/// Sets whether a popup should follow the mouse cursor.
/// </summary>
[AttachedPropertyBrowsableForType(typeof(Popup))]
public static void SetAutoMove(Popup element, bool value)
{
element.SetValue(AutoMoveProperty, value);
}

public static readonly DependencyProperty AutoMoveHorizontalOffsetProperty
= DependencyProperty.RegisterAttached("AutoMoveHorizontalOffset",
typeof(double),
typeof(PopupAssist),
new FrameworkPropertyMetadata(16d));

/// <summary>
/// Gets the horizontal offset for the relative placement of the Popup.
/// </summary>
[AttachedPropertyBrowsableForType(typeof(Popup))]
public static double GetAutoMoveHorizontalOffset(Popup element)
{
return (double)element.GetValue(AutoMoveHorizontalOffsetProperty);
}

/// <summary>
/// Sets the horizontal offset for the relative placement of the Popup.
/// </summary>
[AttachedPropertyBrowsableForType(typeof(Popup))]
public static void SetAutoMoveHorizontalOffset(Popup element, double value)
{
element.SetValue(AutoMoveHorizontalOffsetProperty, value);
}

public static readonly DependencyProperty AutoMoveVerticalOffsetProperty
= DependencyProperty.RegisterAttached("AutoMoveVerticalOffset",
typeof(double),
typeof(PopupAssist),
new FrameworkPropertyMetadata(16d));

/// <summary>
/// Gets the vertical offset for the relative placement of the Popup.
/// </summary>
[AttachedPropertyBrowsableForType(typeof(Popup))]
public static double GetAutoMoveVerticalOffset(Popup element)
{
return (double)element.GetValue(AutoMoveVerticalOffsetProperty);
}

/// <summary>
/// Sets the vertical offset for the relative placement of the Popup.
/// </summary>
[AttachedPropertyBrowsableForType(typeof(Popup))]
public static void SetAutoMoveVerticalOffset(Popup element, double value)
{
element.SetValue(AutoMoveVerticalOffsetProperty, value);
}


// This private attached Property is needed because Popup has no relation to its Target.
static readonly DependencyProperty AutoMovingPopupProperty
= DependencyProperty.RegisterAttached("AutoMovingPopup",
typeof(Popup),
typeof(PopupAssist),
new FrameworkPropertyMetadata(null));

/// <summary>
/// Gets the Popup that should be Automoved
/// </summary>
static Popup GetAutoMovingPopup(FrameworkElement element)
{
return (Popup)element.GetValue(AutoMovingPopupProperty);
}

/// <summary>
/// Sets the Popup that should be Automoved
/// </summary>
static void SetAutoMovingPopup(FrameworkElement element, Popup value)
{
element.SetValue(AutoMovingPopupProperty, value);
}



private static void OnAutoMoveChanged(DependencyObject dependencyObject, DependencyPropertyChangedEventArgs eventArgs)
{
var popup = (Popup)dependencyObject;
if (eventArgs.OldValue != eventArgs.NewValue && eventArgs.NewValue != null)
{
var autoMove = (bool)eventArgs.NewValue;
if (autoMove)
{
popup.Opened += Popup_Opened;
popup.Closed += Popup_Closed;
}
else
{
popup.Opened -= Popup_Opened;
popup.Closed -= Popup_Closed;
}
}
}

private static void Popup_Opened(object sender, EventArgs e)
{
var popup = (Popup)sender;
if (popup.PlacementTarget is FrameworkElement target)
{
// Register the popup with the placementtarget
target.SetCurrentValue(AutoMovingPopupProperty, popup);

// move the Popup on opening to the correct position
MovePopup(target, popup);
target.MouseMove += PopupTargetPreviewMouseMove;
Debug.WriteLine(">>popup opened");
}
}

private static void Popup_Closed(object sender, EventArgs e)
{
var popup = (Popup)sender;
if (popup.PlacementTarget is FrameworkElement target)
{
// Unegister the popup with the placementtarget
target.SetCurrentValue(AutoMovingPopupProperty, popup);

target.MouseMove -= PopupTargetPreviewMouseMove;
Debug.WriteLine(">>popup closed");
}
}

private static void PopupTargetPreviewMouseMove(object sender, MouseEventArgs e)
{
var popup = (sender is FrameworkElement target ? target.GetValue(AutoMovingPopupProperty) : null) as Popup;
MovePopup(sender as IInputElement, popup);
}

private static void MovePopup(IInputElement target, Popup popup)
{
if (popup == null || target == null || popup.PlacementTarget == null)
{
return;
}

popup.SetCurrentValue(Popup.PlacementProperty, PlacementMode.Relative);

var hOffsetFromPopup = GetAutoMoveHorizontalOffset(popup);
var vOffsetFromPopup = GetAutoMoveVerticalOffset(popup);

var dpi = DpiHelper.GetDpi(popup);

Debug.WriteLine(">>dpi >> x: {0} \t y: {1}", dpi.DpiScaleX, dpi.DpiScaleY);

var hDPIOffset = DpiHelper.TransformToDeviceX(popup.PlacementTarget, hOffsetFromPopup, dpi.DpiScaleX);
var vDPIOffset = DpiHelper.TransformToDeviceY(popup.PlacementTarget, vOffsetFromPopup, dpi.DpiScaleY);

var position = Mouse.GetPosition(popup.PlacementTarget);
var newHorizontalOffset = position.X + hDPIOffset;
var newVerticalOffset = position.Y + vDPIOffset;

var topLeftFromScreen = popup.PlacementTarget.PointToScreen(new Point(0, 0));

#pragma warning disable 618
MONITORINFO monitorINFO = null;
#pragma warning restore 618

try
{
monitorINFO = MonitorHelper.GetMonitorInfoFromPoint();
}
catch (UnauthorizedAccessException ex)
{
Debug.WriteLine("UnauthorizedAccessException occurred getting MONITORINFO: {0}", ex.Message);
}

if (monitorINFO != null)
{
Debug.WriteLine(">>rcWork >> w: {0} \t h: {1}", monitorINFO.rcWork.Width, monitorINFO.rcWork.Height);
Debug.WriteLine(">>rcMonitor >> w: {0} \t h: {1}", monitorINFO.rcMonitor.Width, monitorINFO.rcMonitor.Height);

var monitorWorkWidth = Math.Abs(monitorINFO.rcWork.Width);
var monitorWorkHeight = Math.Abs(monitorINFO.rcWork.Height);

topLeftFromScreen.X = -monitorINFO.rcWork.Left + topLeftFromScreen.X;
topLeftFromScreen.Y = -monitorINFO.rcWork.Top + topLeftFromScreen.Y;

var locationX = (int)topLeftFromScreen.X % monitorWorkWidth;
var locationY = (int)topLeftFromScreen.Y % monitorWorkHeight;

var renderDpiWidth = DpiHelper.TransformToDeviceX(popup.PlacementTarget, popup.Child.RenderSize.Width, dpi.DpiScaleX);
var rightX = locationX + newHorizontalOffset + renderDpiWidth;
if (rightX > monitorWorkWidth)
{
newHorizontalOffset = position.X - popup.Child.RenderSize.Width - 0.5 * hDPIOffset;
}

var renderDPIHeight = DpiHelper.TransformToDeviceY(popup.PlacementTarget, popup.Child.RenderSize.Height, dpi.DpiScaleY);
var bottomY = locationY + newVerticalOffset + renderDPIHeight;
if (bottomY > monitorWorkHeight)
{
newVerticalOffset = position.Y - popup.Child.RenderSize.Height - 0.5 * vDPIOffset;
}

Debug.WriteLine(">>Popup >> bY: {0:F} \t rX: {1:F}", bottomY, rightX);

popup.SetCurrentValue(Popup.HorizontalOffsetProperty, newHorizontalOffset);
popup.SetCurrentValue(Popup.VerticalOffsetProperty, newVerticalOffset);

Debug.WriteLine(">>offset >> ho: {0:F} \t vo: {1:F}", popup.HorizontalOffset, popup.VerticalOffset);
}
}
}
}