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improve:截图功能

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CJKmkp
2025-07-30 20:06:29 +08:00
parent 00554e066b
commit 457832fbbe
2 changed files with 228 additions and 0 deletions
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Ink Canvas/Windows/ScreenshotSelectorWindow.xaml
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<Window x:Class="Ink_Canvas.ScreenshotSelectorWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="选择截图区域"
WindowStyle="None"
AllowsTransparency="True"
Background="Transparent"
WindowState="Maximized"
Topmost="True"
ShowInTaskbar="False"
Cursor="Cross"
KeyDown="Window_KeyDown"
MouseLeftButtonDown="Window_MouseLeftButtonDown"
MouseMove="Window_MouseMove"
MouseLeftButtonUp="Window_MouseLeftButtonUp">
<Grid Name="MainGrid">
<!-- 半透明遮罩 -->
<Rectangle Name="OverlayRectangle"
Fill="Black"
Opacity="0.3" />
<!-- 选择区域容器 -->
<Canvas Name="SelectionCanvas">
<!-- 选择区域 -->
<Rectangle Name="SelectionRectangle"
Stroke="Red"
StrokeThickness="2"
Fill="Transparent"
Visibility="Collapsed" />
<!-- 尺寸信息显示 -->
<Border Name="SizeInfoBorder"
Background="Black"
Opacity="0.8"
CornerRadius="3"
Padding="8,4"
Visibility="Collapsed">
<TextBlock Name="SizeInfoText"
Foreground="White"
FontSize="12"
Text="0 x 0" />
</Border>
</Canvas>
<!-- 提示文字 -->
<Border Background="Black"
Opacity="0.8"
CornerRadius="5"
Padding="15,8"
HorizontalAlignment="Center"
VerticalAlignment="Top"
Margin="0,50,0,0">
<TextBlock Name="HintText"
Text="拖拽鼠标选择截图区域，按ESC取消"
Foreground="White"
FontSize="16" />
</Border>
</Grid>
</Window>
Ink Canvas/Windows/ScreenshotSelectorWindow.xaml.cs
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using System;
using System.Drawing;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
using System.Windows.Media;
// 为了避免命名冲突，使用别名
using WpfCanvas = System.Windows.Controls.Canvas;
namespace Ink_Canvas
{
public partial class ScreenshotSelectorWindow : Window
{
private bool _isSelecting = false;
private System.Windows.Point _startPoint;
private System.Windows.Point _currentPoint;
public Rectangle? SelectedArea { get; private set; }
public ScreenshotSelectorWindow()
{
InitializeComponent();
// 设置窗口覆盖所有屏幕
SetupFullScreenOverlay();
// 隐藏提示文字的定时器
var timer = new System.Windows.Threading.DispatcherTimer();
timer.Interval = TimeSpan.FromSeconds(3);
timer.Tick += (s, e) =>
{
HintText.Visibility = Visibility.Collapsed;
timer.Stop();
};
timer.Start();
}
private void SetupFullScreenOverlay()
{
// 获取所有屏幕的虚拟屏幕边界
var virtualScreen = System.Windows.Forms.SystemInformation.VirtualScreen;
// 转换为WPF坐标系统
var dpiScale = GetDpiScale();
this.Left = virtualScreen.Left / dpiScale;
this.Top = virtualScreen.Top / dpiScale;
this.Width = virtualScreen.Width / dpiScale;
this.Height = virtualScreen.Height / dpiScale;
}
private double GetDpiScale()
{
var source = PresentationSource.FromVisual(this);
if (source?.CompositionTarget != null)
{
return source.CompositionTarget.TransformToDevice.M11;
}
return 1.0; // 默认DPI
}
private void Window_KeyDown(object sender, KeyEventArgs e)
{
if (e.Key == Key.Escape)
{
// 取消截图
SelectedArea = null;
DialogResult = false;
Close();
}
}
private void Window_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
_isSelecting = true;
_startPoint = e.GetPosition(this);
_currentPoint = _startPoint;
// 隐藏提示文字
HintText.Visibility = Visibility.Collapsed;
// 显示选择矩形
SelectionRectangle.Visibility = Visibility.Visible;
SizeInfoBorder.Visibility = Visibility.Visible;
// 捕获鼠标
CaptureMouse();
UpdateSelection();
}
private void Window_MouseMove(object sender, MouseEventArgs e)
{
if (_isSelecting)
{
_currentPoint = e.GetPosition(this);
UpdateSelection();
}
}
private void Window_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
{
if (_isSelecting)
{
_isSelecting = false;
ReleaseMouseCapture();
// 计算选择区域
var rect = GetSelectionRectangle();
if (rect.Width > 5 && rect.Height > 5) // 最小尺寸检查
{
// 转换为屏幕坐标，考虑DPI缩放
var dpiScale = GetDpiScale();
var virtualScreen = System.Windows.Forms.SystemInformation.VirtualScreen;
// 计算实际屏幕坐标
int screenX = (int)((rect.X * dpiScale) + virtualScreen.Left);
int screenY = (int)((rect.Y * dpiScale) + virtualScreen.Top);
int screenWidth = (int)(rect.Width * dpiScale);
int screenHeight = (int)(rect.Height * dpiScale);
SelectedArea = new Rectangle(screenX, screenY, screenWidth, screenHeight);
DialogResult = true;
}
else
{
SelectedArea = null;
DialogResult = false;
}
Close();
}
}
private void UpdateSelection()
{
var rect = GetSelectionRectangle();
// 更新选择矩形
WpfCanvas.SetLeft(SelectionRectangle, rect.X);
WpfCanvas.SetTop(SelectionRectangle, rect.Y);
SelectionRectangle.Width = rect.Width;
SelectionRectangle.Height = rect.Height;
// 更新尺寸信息
SizeInfoText.Text = $"{(int)rect.Width} x {(int)rect.Height}";
WpfCanvas.SetLeft(SizeInfoBorder, rect.X);
WpfCanvas.SetTop(SizeInfoBorder, rect.Y - 30);
// 确保尺寸信息不超出屏幕
if (WpfCanvas.GetTop(SizeInfoBorder) < 0)
{
WpfCanvas.SetTop(SizeInfoBorder, rect.Y + rect.Height + 5);
}
}
private Rect GetSelectionRectangle()
{
double x = Math.Min(_startPoint.X, _currentPoint.X);
double y = Math.Min(_startPoint.Y, _currentPoint.Y);
double width = Math.Abs(_currentPoint.X - _startPoint.X);
double height = Math.Abs(_currentPoint.Y - _startPoint.Y);
return new Rect(x, y, width, height);
}
}
}