正如主题行所解释的那样。
我想在 .NET 中的 Button 控件的 Image 属性中实现行为ImageAlign.MiddleCenter
我正在覆盖 Button 的 OnPaint 事件。我使用e.Graphics.DrawImage(Image,oDrawRectagle); 在 Button 控件内绘制图像。然而,这总是出现在按钮的左侧。由于 oDrawRectangle 始终返回 ClientRectangle 的 0,0 坐标。
我希望图像始终对齐ImageAlign.MiddleCenter。我如何实现它?
谢谢
protected override void OnPaint(PaintEventArgs e)
{
Graphics g = e.Graphics;
int iHeight;
int iWidth;
if (Image != null)
{
//newSize = MaintainAspectRatio(Image, ClientRectangle.Width, ClientRectangle.Height);
//iHeight = newSize.Height;
//iWidth = newSize.Width;
Rectangle ResizedRectangle = MaintainAspectRatio(Image,ClientRectangle);
iHeight = ResizedRectangle.Height;
iWidth = ResizedRectangle.Width;
}
else
{
iWidth = ClientRectangle.Width;
iHeight = ClientRectangle.Height;
}
g.FillRectangle(new SolidBrush(Color.FromArgb(213, 221, 224)), ClientRectangle);
// Draw border
Color oLeftTopColor = SystemColors.ControlLightLight;
Color oRightBottomColor = SystemColors.ActiveCaption;
Pen oLeftTopPen = new Pen(oLeftTopColor);
Pen oRightBottomPen = new Pen(oRightBottomColor);
// top line
g.DrawLine(oLeftTopPen, 0, 0, iWidth - 1, 0);
//g.DrawLine(new Pen(SystemColors.ControlLight), 1, 1, iWidth-2, 1);
// bottom line
g.DrawLine(oRightBottomPen, 0, iHeight, iWidth - 1, iHeight);
//g.DrawLine(new Pen(SystemColors.ControlDark), 1, iHeight-2, iWidth-2, iHeight-2);
// right line
g.DrawLine(oRightBottomPen, iWidth, 0, iWidth, iHeight - 1);
//g.DrawLine(new Pen(SystemColors.ControlDark), iWidth-2, 1, iWidth-2, iHeight-2);
// left line
g.DrawLine(oLeftTopPen, 0, 0, 0, iHeight - 1);
//g.DrawLine(new Pen(SystemColors.ControlLightLight), 1, 1, 1, iHeight-2);
// Draw image
if (Image != null)
{
//Rectangle oDrawRectagle = new Rectangle(
// 8, 5, iWidth - 20, iHeight - 10);
Rectangle oDrawRectagle = new Rectangle(
0, 0, iWidth, iHeight);
if (Enabled == false)
{
e.Graphics.DrawImage(Image, oDrawRectagle,
0, 0, Image.Width, Image.Height,
GraphicsUnit.Pixel);
}
else
{
e.Graphics.DrawImage(Image,oDrawRectagle);
}
}
// Draw text
if (Text != null)
{
int iTextTop = 5;
int iTextLeft = 5;
int iMaxTextWidth = iWidth - 10;
int iMaxTextHeight = iHeight - 10;
}
}