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实现了画布无限拖动效果

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This commit is contained in:
fengjiayi
2024-09-07 15:56:34 +08:00
parent ea0a7dd82e
commit ae1a00ee2a
2 changed files with 158 additions and 19 deletions
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19
WorkBench/MainWindow.xaml
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@@ -74,16 +74,17 @@
</StackPanel>
<ScrollViewer Grid.Row="1"
x:Name="FlowChartScrollViewer"
HorizontalScrollBarVisibility="Auto"
VerticalScrollBarVisibility="Auto"
SizeChanged="FlowChartScrollViewer_SizeChanged">
x:Name="FlowChartScrollViewer">
<Canvas x:Name="FlowChartCanvas"
Background="#F2EEE8"
Width="1000" Height="1000"
AllowDrop="True"
Drop="FlowChartCanvas_Drop"
DragOver="FlowChartCanvas_DragOver"/>
Background="#F2EEE8"
AllowDrop="True"
MouseDown="FlowChartCanvas_MouseDown"
MouseMove="FlowChartCanvas_MouseMove"
MouseUp="FlowChartCanvas_MouseUp"
MouseWheel="FlowChartCanvas_MouseWheel"
Drop="FlowChartCanvas_Drop"
DragOver="FlowChartCanvas_DragOver"/>
</ScrollViewer>
</Grid>

158
WorkBench/MainWindow.xaml.cs
View File

@@ -8,20 +8,18 @@ using Serein.WorkBench.Node.View;
using Serein.WorkBench.Themes;
using Serein.WorkBench.tool;
using System.Collections.Concurrent;
using System.Configuration;
using System.Diagnostics;
using System.Drawing.Drawing2D;
using System.IO;
using System.Reflection;
using System.Threading.Tasks.Dataflow;
using System.Security.Cryptography.Xml;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Ink;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Media.Media3D;
using System.Windows.Shapes;
using static Serein.WorkBench.MainWindow;
using DataObject = System.Windows.DataObject;
namespace Serein.WorkBench
{
@@ -202,7 +200,9 @@ namespace Serein.WorkBench
/// 标记是否正在拖动控件
/// </summary>
private bool IsDragging;
private bool IsCanvasDragging;
private Point startMousePosition;
private TranslateTransform transform;
@@ -217,6 +217,9 @@ namespace Serein.WorkBench
// 重定向 Console 输出
var logTextWriter = new LogTextWriter(WriteLog);
Console.SetOut(logTextWriter);
transform = new TranslateTransform();
FlowChartCanvas.RenderTransform = transform;
}
private void Window_Closing(object sender, System.ComponentModel.CancelEventArgs e)
@@ -397,7 +400,7 @@ namespace Serein.WorkBench
{
fromNode.Node.UpstreamBranch.Add(toNode.Node);
}
var connection = new Connection { Start = fromNode, End = toNode, Type = connectionType };
var connection = new Connection { Start = fromNode, End = toNode, Type = connectionType };
toNode.Node.PreviousNodes.Add(fromNode.Node);
BsControl.Draw(FlowChartCanvas, connection);
ConfigureLineContextMenu(connection);
@@ -1268,10 +1271,119 @@ namespace Serein.WorkBench
};
FlowChartCanvas.Children.Add(currentLine);
FlowChartCanvas.MouseMove += FlowChartCanvas_MouseMove;
//FlowChartCanvas.MouseMove += FlowChartCanvas_MouseMove;
this.KeyDown += MainWindow_KeyDown;
}
#region 拖动画布实现缩放平移效果
private void FlowChartCanvas_MouseDown(object sender, MouseButtonEventArgs e)
{
if (e.MiddleButton == MouseButtonState.Pressed)
{
IsCanvasDragging = true;
startMousePosition = e.GetPosition(this);
FlowChartCanvas.CaptureMouse();
}
}
private void FlowChartCanvas_MouseUp(object sender, MouseButtonEventArgs e)
{
if (IsCanvasDragging)
{
IsCanvasDragging = false;
FlowChartCanvas.ReleaseMouseCapture();
foreach(var line in connections)
{
line.Refresh();
}
}
}
private void FlowChartCanvas_MouseWheel(object sender, MouseWheelEventArgs e)
{
if (Keyboard.IsKeyDown(Key.LeftCtrl) || Keyboard.IsKeyDown(Key.RightCtrl))
{
double scale = e.Delta > 0 ? 1.1 : 0.9;
foreach (UIElement element in FlowChartCanvas.Children)
{
element.RenderTransformOrigin = new Point(0.5, 0.5);
var transform = element.RenderTransform as ScaleTransform;
if (transform == null)
{
transform = new ScaleTransform();
element.RenderTransform = transform;
}
transform.ScaleX *= scale;
transform.ScaleY *= scale;
}
foreach (var line in connections)
{
line.Refresh();
}
}
}
private void AdjustCanvasSizeAndContent(double deltaX, double deltaY)
{
var myCanvas = FlowChartCanvas;
// 获取画布的边界框
Rect transformedBounds = myCanvas.RenderTransform.TransformBounds(new Rect(myCanvas.RenderSize));
// 检查画布的左边缘是否超出视图
if (transformedBounds.Left > 0)
{
double offsetX = transformedBounds.Left;
myCanvas.Width += offsetX;
transform.X -= offsetX;
// 移动所有控件的位置
foreach (UIElement child in myCanvas.Children)
{
Canvas.SetLeft(child, Canvas.GetLeft(child) + offsetX);
}
}
// 检查画布的上边缘是否超出视图
if (transformedBounds.Top > 0)
{
double offsetY = transformedBounds.Top;
myCanvas.Height += offsetY;
transform.Y -= offsetY;
// 移动所有控件的位置
foreach (UIElement child in myCanvas.Children)
{
Canvas.SetTop(child, Canvas.GetTop(child) + offsetY);
}
}
//Debug.Print($" {FlowChartScrollViewer.ActualWidth} / {FlowChartScrollViewer.ActualHeight} -- {transformedBounds.Right} / {transformedBounds.Bottom}");
var size = 50;
// 检查画布的右边缘是否超出当前宽度
if (transformedBounds.Right + size < FlowChartScrollViewer.ActualWidth)
{
double extraWidth = FlowChartScrollViewer.ActualWidth - transformedBounds.Right;
FlowChartCanvas.Width += extraWidth;
}
// 检查画布的下边缘是否超出当前高度
if (transformedBounds.Bottom + size < FlowChartScrollViewer.ActualHeight)
{
double extraHeight = FlowChartScrollViewer.ActualHeight - transformedBounds.Bottom;
FlowChartCanvas.Height += extraHeight;
}
}
#endregion
/// <summary>
/// FlowChartCanvas中移动时处理，用于实时更新连接线的终点位置。
/// </summary>
@@ -1289,6 +1401,22 @@ namespace Serein.WorkBench
currentLine.X2 = position.X;
currentLine.Y2 = position.Y;
}
if (IsCanvasDragging)
{
Point currentMousePosition = e.GetPosition(this);
double deltaX = currentMousePosition.X - startMousePosition.X;
double deltaY = currentMousePosition.Y - startMousePosition.Y;
transform.X += deltaX;
transform.Y += deltaY;
startMousePosition = currentMousePosition;
// 调整画布大小和控件位置
AdjustCanvasSizeAndContent(deltaX, deltaY);
}
}
/// <summary>
@@ -1395,7 +1523,7 @@ namespace Serein.WorkBench
{
IsConnecting = false;
startConnectBlock = null;
FlowChartCanvas.MouseMove -= FlowChartCanvas_MouseMove;
//FlowChartCanvas.MouseMove -= FlowChartCanvas_MouseMove;
// 移除虚线
if (currentLine != null)
@@ -2006,6 +2134,7 @@ namespace Serein.WorkBench
{
public static Connection Draw(Canvas canvas, Connection connection)
{
connection.Canvas = canvas;
UpdateBezierLine(canvas, connection);
//MakeDraggable(canvas, connection, connection.Start);
//MakeDraggable(canvas, connection, connection.End);
@@ -2105,6 +2234,8 @@ namespace Serein.WorkBench
public class Connection
{
public ConnectionType Type { get; set; }
public Canvas Canvas { get; set; }// 贝塞尔曲线所在画布
public System.Windows.Shapes.Path BezierPath { get; set; }// 贝塞尔曲线路径
public System.Windows.Shapes.Path ArrowPath { get; set; } // 箭头路径
@@ -2119,9 +2250,14 @@ namespace Serein.WorkBench
canvas.Children.Remove(ArrowPath); // 移除线
_animationStoryboard?.Stop(); // 停止动画
}
public void Refresh()
{
BsControl.Draw(Canvas,this);
}
}
public class BezierLineDrawer
public static class BezierLineDrawer
{
public enum Localhost
{
@@ -2280,6 +2416,8 @@ namespace Serein.WorkBench
}
#endregion
}
}