基于WPF实现边缘停靠效果
最近做的某个功能需要用到边缘停靠,WPF实现了下,效果如下
主要实现原理如下:
1、增加一块热点区域,鼠标进入时,触发显示动画,并隐藏热点区域
2、鼠标拖动或离开窗体,判断窗体离屏幕边缘的距离,符合条件的,触发隐藏动画,并显示热点区域
3、使用Window.Left属性进行窗体动画
需要注意的地方:
1、在拖动窗体时,不能通过窗体的Left属性来进行判断,因为Left没有刷新,可以通过Win32 API 函数GetWindowRect来获取
2、可以增加缓动动画,使动画效果更好。
实现代码如下:
MainWindow.xaml
在XAML里定义了显示和隐藏的动画,窗体定义了两列,第一列就是隐藏时用于显示窗体的热点区域
<blur:BlurWindow x:Class="WpfDockDemo.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:local="clr-namespace:WpfDockDemo" xmlns:blur="clr-namespace:TianXiaTech;assembly=BlurWindow" mc:Ignorable="d" Title="MainWindow" Height="650" Width="305" TitleVisibility="Collapsed" IconVisibility="Collapsed" ControlBoxVisibility="Collapsed" Background="White" Name="main" MouseMove="BlurWindow_MouseMove" MouseLeave="main_MouseLeave" Topmost="True" PreviewMouseDown="main_MouseDown"> <blur:BlurWindow.Resources> <Storyboard x:Key="hiddenAnimation"> <DoubleAnimation Storyboard.TargetName="main" Storyboard.TargetProperty="(Window.Left)" Duration="0:0:0.5" AutoReverse="False"> <DoubleAnimation.EasingFunction> <BackEase Amplitude="0.3"/> </DoubleAnimation.EasingFunction> </DoubleAnimation> </Storyboard> <Storyboard x:Key="showAnimation"> <DoubleAnimation Storyboard.TargetName="main" Storyboard.TargetProperty="(Window.Left)" Duration="0:0:0.5" AutoReverse="False"> <DoubleAnimation.EasingFunction> <BackEase Amplitude="0.3" /> </DoubleAnimation.EasingFunction> </DoubleAnimation> </Storyboard> </blur:BlurWindow.Resources> <Grid> <Grid.ColumnDefinitions> <ColumnDefinition Width="5"/> <ColumnDefinition/> </Grid.ColumnDefinitions> <Grid Background="Transparent" MouseEnter="grid_DockArea_MouseEnter" Name="grid_DockArea" Visibility="Collapsed"> <Border Height="{Binding ElementName=main,Path=ActualHeight}" VerticalAlignment="Center" Width="2" Background="Silver"> <Border.Effect> <DropShadowEffect Color="Black" Opacity=".3"></DropShadowEffect> </Border.Effect> </Border> </Grid> <!--网上随便找的图--> <Image Margin="10" Source="https://pic1.zhimg.com/80/v2-46ae37aad7cb70b4dc4ad4489cdaffdd_720w.webp?source=2c26e567" Grid.Column="1" PreviewMouseDown="main_MouseDown" > <Image.Effect> <DropShadowEffect Opacity=".5"></DropShadowEffect> </Image.Effect> </Image> </Grid> </blur:BlurWindow>
引入用到的api函数
public struct POINT { public int x; public int y; } public struct RECT { public int left; public int top; public int right; public int bottom; } public class User32 { [DllImport("User32.dll")] public static extern int GetCursorPos(ref POINT point); [DllImport("User32.dll")] public static extern bool GetWindowRect(IntPtr hWnd, ref RECT lpRect); }
定义一些用于记录窗体状态的变量
private bool isDocking = true; //是否启用边缘停靠 private bool isAnimation = false; //是否正在动画中 private bool isDraged = false; //是否正在拖动中
定义用于窗体显示和隐藏动画的函数
private void HideWindow(double left = -1) { if (left == -1) { RECT rect = new RECT(); User32.GetWindowRect(new WindowInteropHelper(this).Handle, ref rect); left = rect.left; } if (SystemParameters.PrimaryScreenWidth - left - this.Width > 15) return; if (isAnimation) return; isAnimation = true; hiddenAnimation.Begin(); } private void ShowWindow() { if (isAnimation) return; grid_DockArea.Visibility = Visibility.Collapsed; isAnimation = true; showAnimation.Begin(); }
处理鼠标移动事件
private void BlurWindow_MouseMove(object sender, MouseEventArgs e) { if (e.LeftButton == MouseButtonState.Pressed) { try { this.DragMove(); isDraged = true; } catch { } } if (e.LeftButton == MouseButtonState.Released && isDocking == true && isDraged == true) { POINT point = new POINT(); if (User32.GetCursorPos(ref point) == 1) { var pos = e.GetPosition(this); if (pos.X < 0 && pos.Y < 0) HideWindow(); } isDraged = false; } }
处理鼠标按下事件
private void main_MouseDown(object sender, MouseButtonEventArgs e) { var pos = e.GetPosition(this); if (pos.X >= 0 && pos.Y >= 0) isDraged = true; }
处理鼠标离开事件
private void main_MouseLeave(object sender, MouseEventArgs e) { if (isDocking && isDraged == false) { HideWindow(); } }
这样就可以实现了一个简单的边缘停靠效果。现在只实现了屏幕右侧的边缘停靠,左边和上面可以如法炮制。
窗体第一次运行是不会主动隐藏的,需要手动控制 一下。
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