WPF 無邊框窗體滑鼠拖動改變大小和移動

**:**

protected override void onsourceinitialized(eventargs e)} 

protected virtual intptr wndproc(intptr hwnd, int msg, intptr wparam, intptr lparam, ref bool handled)

private const int wm_nchittest = 0x0084;

private readonly int agwidth = 12; //拐角寬度
private readonly int bthickness = 4; // 邊框寬度
private point mousepoint = new point(); //滑鼠座標
protected virtual intptr wndproc(intptr hwnd, int msg, intptr wparam, intptr lparam, ref bool handled)
// 視窗左下角 
else if (this.actualheight + this.top - this.mousepoint.y <= this.agwidth 
&& this.mousepoint.x - this.left <= this.agwidth)
// 視窗右上角
else if (this.mousepoint.y - this.top <= this.agwidth 
&& this.actualwidth + this.left - this.mousepoint.x <= this.agwidth)
// 視窗右下角
else if (this.actualwidth + this.left - this.mousepoint.x <= this.agwidth 
&& this.actualheight + this.top - this.mousepoint.y <= this.agwidth)
// 視窗左側
else if (this.mousepoint.x - this.left <= this.bthickness)
// 視窗右側
else if (this.actualwidth + this.left - this.mousepoint.x <= this.bthickness)
// 視窗上方
else if (this.mousepoint.y - this.top <= this.bthickness)
// 視窗下方
else if (this.actualheight + this.top - this.mousepoint.y <= this.bthickness)
else // 視窗移動
#endregion
}return intptr.zero;
}

public enum hittest:int

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