private void DrawCanvas(CanvasContext canvasCtx)
{
var size = canvasCtx.GetRealSize(width, height - toolBarHeight);
if (Event.current.type == EventType.Repaint)
{
GL.PushMatrix();
CreateLineMaterial();
lineMaterial.SetPass(0);
GL.LoadIdentity();
GL.MultMatrix(canvasCtx.GetTRSMatrix(size));
var p1 = canvasCtx.GetLocalPos(new Vector2(0, 1), size);
var p2 = canvasCtx.GetLocalPos(new Vector2(1, 0), size);
GLHelper.DrawGrid(100, new Rect(p1, p2 - p1));
OnDrawCanvas(canvasCtx);
if (canvasCtx.m_isDrawSelection)
{
if (canvasCtx.m_dragStartPosition != canvasCtx.m_curLocalPosition)
{
GLHelper.DrawRectSolid(canvasCtx.m_dragStartPosition, canvasCtx.m_curLocalPosition, new Color(0, 0, 0, 0.5f));
}
}
GL.PopMatrix();
}
}
protected virtual void ProcessEventInCanvas(CanvasContext canvasCtx)
{
canvasCtx.m_curLocalPosition = canvasCtx.GetLocalPos(canvasCtx.m_curMouseNormalizePosition, canvasCtx.GetRealSize(width, height - toolBarHeight));
//鼠标中键拖动视图
if (Event.current.type == EventType.MouseDrag && Event.current.button == 2)
{
canvasCtx.m_offset += Event.current.delta;
Repaint();
}
//鼠标滚轮缩放视图
if (Event.current.type == EventType.ScrollWheel)
{
canvasCtx.scale += Event.current.delta.y * -0.01f;
Repaint();
}
//选择和移动逻辑
//按下鼠标左键
if (Event.current.type == EventType.MouseDown && Event.current.button == 0)
{
var clickElement = canvasCtx.TestPoint(canvasCtx.m_curLocalPosition);
canvasCtx.m_dragStartPosition = canvasCtx.m_curLocalPosition;
if (clickElement == null)
{
//开始绘制选区
canvasCtx.ClearAllSelected();
canvasCtx.m_isDrawSelection = true;
Repaint();
}
else
{
if (!canvasCtx.IsSelected(clickElement))
{
canvasCtx.ClearAllSelected();
canvasCtx.AddSelected(clickElement);
}
//开始拖动物体
canvasCtx.m_isDragElement = true;
foreach (var element in canvasCtx.m_selectedElements)
{
if (element.canDrag)
{
element.m_dragStartPosition = element.position;
}
}
Repaint();
}
}
//鼠标左键拖动
if (Event.current.type == EventType.MouseDrag && Event.current.button == 0)
{
if (canvasCtx.m_isDragElement)
{
foreach (var element in canvasCtx.m_selectedElements)
{
if (element.canDrag)
{
element.position = element.m_dragStartPosition + (canvasCtx.m_curLocalPosition - canvasCtx.m_dragStartPosition);
}
}
Repaint();
}
}
//松开鼠标左键
if (Event.current.type == EventType.MouseUp && Event.current.button == 0)
{
//结束绘制选区，根据画出的选取选择对象
if (canvasCtx.m_isDrawSelection == true)
{
canvasCtx.m_isDrawSelection = false;
var selections = canvasCtx.TestRect(canvasCtx.m_dragStartPosition, canvasCtx.m_curLocalPosition);
canvasCtx.ClearAllSelected();
canvasCtx.AddSelected(selections);
Repaint();
}
else if (canvasCtx.m_isDragElement)
{
canvasCtx.m_isDragElement = false;
}
}
}
