GDI？¢的OnPaint？¢自动滚屏 [英] GDI?￠OnPaint?￠AutoScroll

问题描述

我在面板上画一个网格。并且panel1''属性AutoScroll设置为true。当

HScroollBar是Scroolling时，网格是错误的。

我已经重写了WndProc的方法。但效果出乎意料。

我该怎么办？很多。

主要代码在这里：

class frm

private MyApp.Panel panel1;

this .panel1.Paint + = new

System.Windows.Forms.PaintEventHandler（this.OnPain t）;


private void OnPaint（对象发送者，系统。 Windows.Forms.PaintEventArgs e）

{


图形grPaint = e.Graphics;


grPaint.Flush （System.Drawing.Drawing2D.FlushIntent ion.Sync）;


SolidBrush brushWhite = new SolidBrush（Color.White）;

Pen blackpen = new Pen（ Color.Black，2）;


//清除屏幕

grPaint.FillRectangle（brushWhite，e.ClipRectangle）;

//绘制网格

grPaint.DrawString（" testsdsdsadssadadafsewr3wqr32r"，new

Font（" Arial"，12），new SolidBrush（ Color.Black），_ RECTSIZE_，10）;

grPaint.DrawString（" testsdsdsadssadadafsewr3wqr32r"，new

Font（" Arial"，12），new SolidBrush（ Color.Black），_ RECTSIZE_，30）;


for（int i = 0; i< iCols; i ++）

{

for（int j = 0; j< iRows; j ++）

{

grPaint.DrawRectangle（blackpen，5 * _RECTSIZE_ +（i * _RECTSIZE_），3 *

_RECTSIZE_ +（j * _RECTSIZE _），_ RECTSIZE _，_ RECTSIZE_）;

}

}

brushWhite.Dispose （）;

blackpen.Dispose（）;

}

类Panel：System.Windows.Forms.Panel

{


[System.Security.Permissions.PermissionSet（System.S ecurity.Permissions.Secur

ityAction.Demand，Name =" FullTrust" ）]

protected override void WndProc（ref message m）

{

if（m.Msg == 0x0114）

{

Invalidate（）;

}

else if（m.Msg == 0x0115）

{

Invalidate（）;

}

else if（m.Msg == 0x020A）

{

无效（）;

}

其他

{


}

base.Wn dProc（ref m）;

}

}

I draw a grid on a panel.And panel1'' property AutoScroll is set true.When
HScroollBar is Scroolling,the grid is error.
I have rewritten the mathod of WndProc.But the effect is unexpected.
How can i do? Thx a lot.
Main codes go here:
class frm
private MyApp.Panel panel1;
this.panel1.Paint += new
System.Windows.Forms.PaintEventHandler(this.OnPain t);

private void OnPaint(object sender, System.Windows.Forms.PaintEventArgs e)
{

Graphics grPaint = e.Graphics;

grPaint.Flush(System.Drawing.Drawing2D.FlushIntent ion.Sync);

SolidBrush brushWhite = new SolidBrush(Color.White);
Pen blackpen = new Pen(Color.Black,2);

// Clear the screen
grPaint.FillRectangle(brushWhite, e.ClipRectangle);

// Draw the grid
grPaint.DrawString("testsdsdsadssadadafsewr3wqr32r ", new
Font("Arial",12), new SolidBrush(Color.Black),_RECTSIZE_,10);
grPaint.DrawString("testsdsdsadssadadafsewr3wqr32r ", new
Font("Arial",12), new SolidBrush(Color.Black),_RECTSIZE_,30);

for(int i=0;i<iCols;i++)
{
for(int j=0;j<iRows;j++)
{
grPaint.DrawRectangle(blackpen, 5 * _RECTSIZE_ + (i* _RECTSIZE_), 3 *
_RECTSIZE_ + (j*_RECTSIZE_),_RECTSIZE_,_RECTSIZE_);
}
}
brushWhite.Dispose();
blackpen.Dispose();
}
class Panel :System.Windows.Forms.Panel
{

[System.Security.Permissions.PermissionSet(System.S ecurity.Permissions.Secur
ityAction.Demand, Name="FullTrust")]
protected override void WndProc(ref Message m)
{
if(m.Msg == 0x0114)
{
Invalidate();
}
else if(m.Msg == 0x0115)
{
Invalidate();
}
else if(m.Msg == 0x020A)
{
Invalidate();
}
else
{

}
base.WndProc(ref m);
}
}

推荐答案

I你会想要在

OnPaint代码中处理panel1.autoscrollposition，找出网格左上角的起点。小心

，当你向右移动面板并且向上移动面板时，该位置将是负面的。当你向左和向下滚动时。


我不确定你尝试用WndProc做什么，但是如果它用

键滚动，你可以通过使用表单OnKeyDown事件和

使用panel1.AutoScrollPosition = //新位置或+ / - =增量（小心

边界错误）


-

使用M2，Opera的革命性电子邮件客户端： http://www.opera.com/m2/

I think you will want to handle the panel1.autoscrollposition in your
OnPaint code to find out where upper left of the grid will start. Beware
that the position will be negative as you move the panel "to the right and
upwards" when scrolling left and down.

I''m not sure what you try to do with WndProc, but if it is scrolling with
keys, you can do that much easier by using the forms OnKeyDown event and
use panel1.AutoScrollPosition = // new position or +/-= increment (beware
of boundaries errors)

--
Using M2, Opera''s revolutionary e-mail client: http://www.opera.com/m2/

感谢Morten Wennevik。

我是.net的初学者。

我重写OnKeyDown方法，但它不起作用。我的代码在这里：


public int iX = 0，iY = 0;

protected override void OnKeyDown（KeyEventArgs e）

{

iX = this.AutoScrollPosition.X;

iY = this.AutoScrollPosition.Y;

base.OnKeyDown（e）;

MessageBox.Show（iX.ToString（））;

}

Thank Morten Wennevik.
I''m a beginner for .net.
I rewirte OnKeyDown method,but it doen''t work. My code goes here:

public int iX = 0 ,iY = 0 ;
protected override void OnKeyDown(KeyEventArgs e)
{
iX = this.AutoScrollPosition.X;
iY = this.AutoScrollPosition.Y;
base.OnKeyDown(e);
MessageBox.Show(iX.ToString());
}

你想要完成什么？


如果你想要箭头键滚动你可以使用这样的东西


protected override void OnKeyDown（KeyEventArgs e）

{

// xStep和yStep是每次向左/向上滚动的金额

关键点击

int xStep = 10;

int yStep = 10;

//检查所有按下的键

// AutoScrollPosition实际为负数或0 ，但是当你设置

autoscrollposition

//它必须是正数，所以我们设置// AutoScrollPosition = new Point（ -

AutoScrollPosition.X，-AutoScrollPosition。 Y）;

开关（e.KeyCode）

{

case Keys.Right：

AutoScrollPosition = new Point（-AutoScrollPosition.X + xStep， -

AutoScrollPosition.Y）;

break;

case Keys.Left：

AutoScrollPosition = new Point（-AutoScrollPosition.X - xStep， -

AutoScrollPosition.Y）;

break;

case Keys .Up：

AutoScrollPosition = new Point（-AutoScrollPosition.X， -

AutoScrollPosition.Y - yStep）;

break;

case Keys.Down：

AutoScrollPosition = new Point（-AutoScrollPosition.X， -

AutoScrollPosition.Y + yStep）;

休息;

默认：

休息;

}

//您可以使用标签控件来显示当前的自动滚动。

//每次滚动时设置顶部和左侧位置，或者标签将移动

，窗口为

label1。 Top = 0;

label1.Left = 0;

label1.Text = AutoScrollPosit ion.ToString（）;

}

-

使用M2，Opera的革命性电子邮件客户端： http://www.opera.com/m2/

What are you trying to accomplish?

If you want the arrow keys to scroll you can use something like this

protected override void OnKeyDown(KeyEventArgs e)
{
// xStep and yStep is the amount to scroll left-right/up-down each time
the key is hit
int xStep = 10;
int yStep = 10;
// Check all keys pressed
// The AutoScrollPosition is actually negative or 0, but when you set the
autoscrollposition
// it has to be positive, so we set // AutoScrollPosition = new Point(-
AutoScrollPosition.X, -AutoScrollPosition.Y);
switch(e.KeyCode)
{
case Keys.Right:
AutoScrollPosition = new Point(-AutoScrollPosition.X + xStep, -
AutoScrollPosition.Y);
break;
case Keys.Left:
AutoScrollPosition = new Point(-AutoScrollPosition.X - xStep, -
AutoScrollPosition.Y);
break;
case Keys.Up:
AutoScrollPosition = new Point(-AutoScrollPosition.X, -
AutoScrollPosition.Y - yStep);
break;
case Keys.Down:
AutoScrollPosition = new Point(-AutoScrollPosition.X, -
AutoScrollPosition.Y + yStep);
break;
default:
break;
}
// You can use a label control to show the current autoscrollposition.
// Set top and left position each time you scroll or the label will move
with the window
label1.Top = 0;
label1.Left = 0;
label1.Text = AutoScrollPosition.ToString();
}
--
Using M2, Opera''s revolutionary e-mail client: http://www.opera.com/m2/

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