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feat: 选区截图时保留屏幕笔迹 (#406)

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* feat: 使用选区截图时，不清除 Strokes（Keep it on screen）

* fix: 浮动栏选区截图前强制保持墨迹可见

* fix: 避免选区截图回滚 inkCanvas 运行时状态

* fix: 截图前退出并在结束后恢复批注状态

* fix: 截图流程改用轻量批注暂停避免副作用

* feat: 选区截图添加包含墨迹开关

* fix: 避免选区截图墨迹重复渲染

* fix: 全屏基础截图排除主窗口后再叠加墨迹

* fix: 隐藏浮动栏后再进入选区截图

* fix: 添加到白板时不强制恢复浮动栏可见性

* fix: 防止重复启动选区截图实例

* fix: 仅在白板接管成功后跳过浮动栏恢复

* feat: 选区截图时实时预览包含墨迹开关

* fix: 合并截图选择器OnClosed逻辑避免重复定义
This commit is contained in:
tayasui rainnya!
2026-03-28 17:11:18 +08:00
committed by GitHub
parent fd137ae787
commit f7aa107a62
4 changed files with 280 additions and 17 deletions
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Ink Canvas/MainWindow_cs/MW_ImageInsert.cs
+123 -6
View File
@@ -9,6 +9,7 @@ using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Forms;
using System.Windows.Ink;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Threading;
@@ -30,15 +31,17 @@ namespace Ink_Canvas
public Bitmap CameraImage;
public BitmapSource CameraBitmapSource;
public bool AddToWhiteboard;
public bool IncludeInk;
public ScreenshotResult(Rectangle area, List<Point> path = null, Bitmap cameraImage = null,
BitmapSource cameraBitmapSource = null, bool addToWhiteboard = false)
BitmapSource cameraBitmapSource = null, bool addToWhiteboard = false, bool includeInk = true)
{
Area = area;
Path = path;
CameraImage = cameraImage;
CameraBitmapSource = cameraBitmapSource;
AddToWhiteboard = addToWhiteboard;
IncludeInk = includeInk;
}
}
@@ -95,7 +98,7 @@ namespace Ink_Canvas
else if (screenshotResult.Value.Area.Width > 0 && screenshotResult.Value.Area.Height > 0)
{
// 屏幕截图
using (var originalBitmap = CaptureScreenArea(screenshotResult.Value.Area))
using (var originalBitmap = CaptureScreenAreaWithOptionalInk(screenshotResult.Value.Area, screenshotResult.Value.IncludeInk))
{
if (originalBitmap != null)
{
@@ -207,7 +210,16 @@ namespace Ink_Canvas
{
await Application.Current.Dispatcher.InvokeAsync(() =>
{
var selectorWindow = new ScreenshotSelectorWindow();
var selectorWindow = new ScreenshotSelectorWindow(shouldIncludeInk =>
{
if (inkCanvas == null)
{
return;
}
inkCanvas.Visibility = shouldIncludeInk ? Visibility.Visible : Visibility.Collapsed;
Dispatcher.Invoke(() => { }, DispatcherPriority.Render);
});
if (selectorWindow.ShowDialog() == true)
{
// 检查是否是摄像头截图
@@ -218,7 +230,8 @@ namespace Ink_Canvas
null, // 摄像头截图不需要路径
null, // 不再使用Bitmap
selectorWindow.CameraBitmapSource, // 摄像头BitmapSource
selectorWindow.ShouldAddToWhiteboard
selectorWindow.ShouldAddToWhiteboard,
selectorWindow.ShouldIncludeInk
);
}
else if (selectorWindow.CameraImage != null)
@@ -228,7 +241,8 @@ namespace Ink_Canvas
null, // 摄像头截图不需要路径
selectorWindow.CameraImage, // 摄像头图像
null,
selectorWindow.ShouldAddToWhiteboard
selectorWindow.ShouldAddToWhiteboard,
selectorWindow.ShouldIncludeInk
);
}
else
@@ -238,7 +252,8 @@ namespace Ink_Canvas
selectorWindow.SelectedPath,
null,
null,
selectorWindow.ShouldAddToWhiteboard
selectorWindow.ShouldAddToWhiteboard,
selectorWindow.ShouldIncludeInk
);
}
}
@@ -304,6 +319,108 @@ namespace Ink_Canvas
}
}
private Bitmap CaptureScreenAreaWithOptionalInk(Rectangle area, bool includeInk)
{
Bitmap bitmap = null;
StrokeCollection strokesForOverlay = null;
Point? inkCanvasTopLeftOnScreen = null;
System.Windows.Media.Matrix? dpiTransform = null;
var originalWindowVisibility = Visibility;
try
{
if (includeInk && inkCanvas != null && inkCanvas.Strokes.Count > 0)
{
strokesForOverlay = inkCanvas.Strokes.Clone();
var source = PresentationSource.FromVisual(inkCanvas);
if (source?.CompositionTarget != null)
{
dpiTransform = source.CompositionTarget.TransformToDevice;
}
inkCanvasTopLeftOnScreen = inkCanvas.PointToScreen(new Point(0, 0));
}
// 先隐藏主窗口再截取屏幕，确保基础截图不包含主线程 UI（含墨迹层）。
Visibility = Visibility.Hidden;
Dispatcher.Invoke(() => { }, DispatcherPriority.Render);
bitmap = CaptureScreenArea(area);
}
catch (Exception ex)
{
LogHelper.WriteLogToFile($"准备截图时处理墨迹失败: {ex.Message}", LogHelper.LogType.Error);
bitmap?.Dispose();
return null;
}
finally
{
Visibility = originalWindowVisibility;
Dispatcher.Invoke(() => { }, DispatcherPriority.Render);
}
if (bitmap == null || !includeInk || strokesForOverlay == null || strokesForOverlay.Count == 0)
{
return bitmap;
}
try
{
OverlayInkStrokesOnBitmap(bitmap, area, strokesForOverlay, inkCanvasTopLeftOnScreen, dpiTransform);
}
catch (Exception ex)
{
LogHelper.WriteLogToFile($"叠加墨迹到截图失败: {ex.Message}", LogHelper.LogType.Error);
}
return bitmap;
}
private void OverlayInkStrokesOnBitmap(
Bitmap bitmap,
Rectangle area,
StrokeCollection strokes,
Point? inkCanvasTopLeftOnScreen = null,
System.Windows.Media.Matrix? dpiTransform = null)
{
if (bitmap == null || strokes == null || strokes.Count == 0)
{
return;
}
var transform = dpiTransform ?? new System.Windows.Media.Matrix(1, 0, 0, 1, 0, 0);
var topLeft = inkCanvasTopLeftOnScreen ?? new Point(area.X, area.Y);
var offsetX = topLeft.X * transform.M11 - area.X;
var offsetY = topLeft.Y * transform.M22 - area.Y;
var drawingVisual = new DrawingVisual();
using (var drawingContext = drawingVisual.RenderOpen())
{
drawingContext.PushTransform(new TranslateTransform(offsetX, offsetY));
strokes.Draw(drawingContext);
drawingContext.Pop();
}
var renderBitmap = new RenderTargetBitmap(bitmap.Width, bitmap.Height, 96, 96, PixelFormats.Pbgra32);
renderBitmap.Render(drawingVisual);
var encoder = new PngBitmapEncoder();
encoder.Frames.Add(BitmapFrame.Create(renderBitmap));
using (var memoryStream = new MemoryStream())
{
encoder.Save(memoryStream);
memoryStream.Position = 0;
using (var overlayBitmap = new Bitmap(memoryStream))
using (var graphics = Graphics.FromImage(bitmap))
{
graphics.CompositingMode = CompositingMode.SourceOver;
graphics.DrawImage(overlayBitmap, 0, 0, bitmap.Width, bitmap.Height);
}
}
}
/// <summary>
/// 将截图插入到画布
/// </summary>