下一个例子会把这个写成一个style + cs类，这样方便模板调用。
ModernWindow.axaml代码
<Window xmlns="https://github.com/avaloniaui"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"Height="300" Width="300"x:Class="AvaloniaUI.ModernWindow"SystemDecorations="None"TransparencyLevelHint="Transparent"Background="Transparent"Title="ModernWindow"><Border x:Name="windowFrame"BorderBrush="#395984"BorderThickness="1"CornerRadius="0,20,30,40"><Border.Background><LinearGradientBrush><GradientStop Color="#E7EBF7" Offset="0"/><GradientStop Color="#CEE3FF" Offset="0.5"/></LinearGradientBrush></Border.Background><Grid RowDefinitions="auto,*,auto"><!-- 标题栏：PointerPressed 用于拖动窗口 --><Grid Grid.Row="0"Margin="1"Background="Transparent"ColumnDefinitions="*,auto"PointerPressed="titleBar_PointerPressed"><!-- 可拖拽区域 --><TextBlock Grid.Column="0"VerticalAlignment="Center"Padding="5"Text="Modern Window"/><!-- 关闭按钮 --><Button Grid.Column="1"Margin="4"Padding="6,2"VerticalAlignment="Center"Click="cmdClose_Click">x</Button></Grid><Grid Grid.Row="1" Background="#B5CBEF" ><TextBlock Grid.Row="1" VerticalAlignment="Center"HorizontalAlignment="Center"Foreground="White"FontSize="20"Text="Content Goes Here"/></Grid><!-- Footer --><Grid Grid.Row="2"Margin="1,10,1,1"ColumnDefinitions="*,auto"Background="Transparent"><!-- Footer 文本 --><TextBlock Grid.Column="0"VerticalAlignment="Center"HorizontalAlignment="Center"Padding="5"Text="Footer"/><!-- 右下角 ResizeGrip --><Border Grid.Column="1" ZIndex="100"Width="16"Height="16"Margin="5"Background="Transparent"HorizontalAlignment="Right"VerticalAlignment="Bottom"Tag="BottomRight"PointerPressed="resizeGrip_PointerPressed"PointerMoved="resizeGrip_PointerMoved"PointerReleased="resizeGrip_PointerReleased"><Rectangle Margin="1"><Rectangle.Fill><VisualBrush TileMode="Tile"DestinationRect="0,0,4,4"SourceRect="0,0,8,8"><VisualBrush.Visual><Canvas Width="8" Height="8"><Rectangle Width="4"Height="4"Canvas.Left="4"Canvas.Top="4"Fill="#AAA"/></Canvas></VisualBrush.Visual></VisualBrush></Rectangle.Fill></Rectangle></Border></Grid><!-- 四边 --><Rectangle Width="5" Fill="Transparent" HorizontalAlignment="Left" VerticalAlignment="Stretch"Cursor="SizeWestEast" Tag="Left"Grid.RowSpan="3"PointerPressed="resizeGrip_PointerPressed"PointerMoved="resizeGrip_PointerMoved"PointerReleased="resizeGrip_PointerReleased"/><Rectangle Width="5" Fill="Transparent" HorizontalAlignment="Right" VerticalAlignment="Stretch"Cursor="SizeWestEast" Tag="Right"Grid.RowSpan="3"PointerPressed="resizeGrip_PointerPressed"PointerMoved="resizeGrip_PointerMoved"PointerReleased="resizeGrip_PointerReleased"/><Rectangle Height="5" Fill="Transparent" HorizontalAlignment="Stretch" VerticalAlignment="Top"Cursor="SizeNorthSouth" Tag="Top"Grid.RowSpan="3"PointerPressed="resizeGrip_PointerPressed"PointerMoved="resizeGrip_PointerMoved"PointerReleased="resizeGrip_PointerReleased"/><Rectangle Height="5" Fill="Transparent" HorizontalAlignment="Stretch" VerticalAlignment="Bottom"Cursor="SizeNorthSouth" Tag="Bottom"Grid.RowSpan="3"PointerPressed="resizeGrip_PointerPressed"PointerMoved="resizeGrip_PointerMoved"PointerReleased="resizeGrip_PointerReleased"/><!-- 四角（10x10） --><Rectangle Width="10" Height="10" Fill="Transparent"HorizontalAlignment="Left" VerticalAlignment="Top"Cursor="SizeAll" Tag="TopLeft"Grid.RowSpan="3"PointerPressed="resizeGrip_PointerPressed"PointerMoved="resizeGrip_PointerMoved"PointerReleased="resizeGrip_PointerReleased"/><Rectangle Width="10" Height="10" Fill="Transparent"HorizontalAlignment="Right" VerticalAlignment="Top"Cursor="SizeAll" Tag="TopRight"Grid.RowSpan="3"PointerPressed="resizeGrip_PointerPressed"PointerMoved="resizeGrip_PointerMoved"PointerReleased="resizeGrip_PointerReleased"/><Rectangle Width="10" Height="10" Fill="Transparent"HorizontalAlignment="Left" VerticalAlignment="Bottom"Cursor="SizeAll" Tag="BottomLeft"Grid.RowSpan="3"PointerPressed="resizeGrip_PointerPressed"PointerMoved="resizeGrip_PointerMoved"PointerReleased="resizeGrip_PointerReleased"/><Rectangle Width="10" Height="10" Fill="Transparent"HorizontalAlignment="Right" VerticalAlignment="Bottom"Cursor="SizeAll" Tag="BottomRight"Grid.RowSpan="3"PointerPressed="resizeGrip_PointerPressed"PointerMoved="resizeGrip_PointerMoved"PointerReleased="resizeGrip_PointerReleased"/></Grid></Border> </Window>
ModernWindow.axaml.cs代码
using Avalonia;
using Avalonia.Controls;
using Avalonia.Input;
using Avalonia.Interactivity;
using System;namespace AvaloniaUI;public partial class ModernWindow : Window
{[Flags]private enum ResizeEdges{None = 0,Left = 1,Top = 2,Right = 4,Bottom = 8}private bool isResizing;private ResizeEdges edges;private PixelPoint startWindowPos; // Pixelprivate Size startWindowSize; // DIPprivate PixelPoint startPointerScreenPx; // Screen Pixelprivate double startRenderScaling;public ModernWindow(){InitializeComponent();MinWidth = 150;MinHeight = 120;}private void titleBar_PointerPressed(object? sender, PointerPressedEventArgs e){if (e.GetCurrentPoint(this).Properties.IsLeftButtonPressed)BeginMoveDrag(e);}private void cmdClose_Click(object? sender, RoutedEventArgs e){Close();}private void resizeGrip_PointerPressed(object? sender, PointerPressedEventArgs e){if (!e.GetCurrentPoint(this).Properties.IsLeftButtonPressed)return;if (sender is not Control c)return;edges = ParseEdges(c.Tag as string);if (edges == ResizeEdges.None)return;var topLevel = TopLevel.GetTopLevel(this);if (topLevel is null)return;isResizing = true;startWindowPos = Position; // PixelstartWindowSize = new Size(Bounds.Width, Bounds.Height); // DIPstartRenderScaling = RenderScaling;startPointerScreenPx = GetPointerScreenPx(e, topLevel);e.Pointer.Capture(c);e.Handled = true;}private void resizeGrip_PointerReleased(object? sender, PointerReleasedEventArgs e){if (!isResizing)return;isResizing = false;edges = ResizeEdges.None;e.Pointer?.Capture(null);e.Handled = true;}private void resizeGrip_PointerMoved(object? sender, PointerEventArgs e){if (!isResizing || edges == ResizeEdges.None)return;var topLevel = TopLevel.GetTopLevel(this);if (topLevel is null)return;var pointerScreenPx = GetPointerScreenPx(e, topLevel);var dxPx = pointerScreenPx.X - startPointerScreenPx.X;var dyPx = pointerScreenPx.Y - startPointerScreenPx.Y;var dxDip = dxPx / startRenderScaling;var dyDip = dyPx / startRenderScaling;var newX = startWindowPos.X;var newY = startWindowPos.Y;var newW = startWindowSize.Width;var newH = startWindowSize.Height;var hasLeft = (edges & ResizeEdges.Left) != 0;var hasRight = (edges & ResizeEdges.Right) != 0;var hasTop = (edges & ResizeEdges.Top) != 0;var hasBottom = (edges & ResizeEdges.Bottom) != 0;if (hasRight)newW = Math.Max(MinWidth, startWindowSize.Width + dxDip);if (hasBottom)newH = Math.Max(MinHeight, startWindowSize.Height + dyDip);if (hasLeft){newW = Math.Max(MinWidth, startWindowSize.Width - dxDip);newX = startWindowPos.X + dxPx;if (newW <= MinWidth)newX = startWindowPos.X + ClampDeltaPxForMin(startWindowSize.Width, MinWidth);}if (hasTop){newH = Math.Max(MinHeight, startWindowSize.Height - dyDip);newY = startWindowPos.Y + dyPx;if (newH <= MinHeight)newY = startWindowPos.Y + ClampDeltaPxForMin(startWindowSize.Height, MinHeight);}Position = new PixelPoint(newX, newY);Width = newW;Height = newH;e.Handled = true;}private static ResizeEdges ParseEdges(string? tag){return tag switch{"Left" => ResizeEdges.Left,"Right" => ResizeEdges.Right,"Top" => ResizeEdges.Top,"Bottom" => ResizeEdges.Bottom,"TopLeft" => ResizeEdges.Top | ResizeEdges.Left,"TopRight" => ResizeEdges.Top | ResizeEdges.Right,"BottomLeft" => ResizeEdges.Bottom | ResizeEdges.Left,"BottomRight" => ResizeEdges.Bottom | ResizeEdges.Right,_ => ResizeEdges.None};}private static PixelPoint GetPointerScreenPx(PointerEventArgs e, TopLevel topLevel){var pInTopLevel = e.GetPosition(topLevel); // DIPreturn topLevel.PointToScreen(pInTopLevel); // Pixel}private int ClampDeltaPxForMin(double startSizeDip, double minSizeDip){var clampPx = (startSizeDip - minSizeDip) * startRenderScaling;return (int)Math.Round(clampPx);}
}
运行效果
