blocks|key|473394|text|您可以在AutoScroll+=+true中使用Panel。在此之后，如果您将任何控件放入其中，只要它们的大小大于面板的大小，面板就会自动显示滚动条。这个技巧也可以用于任何自定义控件，只要你将它放在AutoScroll面板中，并根据需要调整大小即可。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|473395|entityMap^0|4|H|O|5|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|M|8|@]|D|@]|E|$]]]|G|$]]

you can use a<code>Panel</code> with <code>AutoScroll = true</code>. After that, if you put any controls inside it, as long as their size is larger than the size of panel, the panel will automatically show scroll bars.. The trick can be used for any custom control asa well, as long as you place it inside a AutoScroll panel, and size it as large as you need it to be.

blocks|key|2380236|text|您有两个选择。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2380237|好消息是，这是可能的，而且两者都不是真的很难。|2380238|2380239|坏消息是，对于一种选择，你必须调整你所有的绘图代码：|unordered-list-item|2380240|2380241|首先让你的控件，我使用一个Panel，让Autoscroll=true;|offset|length|style|CODE|2380242|然后您需要添加一个虚拟控件，我使用另一个Panel，可能像这样，足够靠近右侧和底部，以强制ScrollBars显示：|BOLD|2380243|public+Form1()
{
++++InitializeComponent();

++++Panel+panelDummy+=+new+Panel();
++++panelDummy.Size+=+new+Size(1,1);
++++panelDummy.Location+=+new+Point(yourMaxX,yourMaxY);
++++panel1.Controls.Add(panelDummy);
}|code-block|syntax|javascript|2380244|然后你需要调整你的绘图代码。下面是如何实现的：|2380245|private+void+panel1_Paint(object+sender,+PaintEventArgs+e)
{
++++int+xx+=+panel1.HorizontalScroll.Value;
++++int+yy+=+panel1.VerticalScroll.Value;

++++e.Graphics.FillRectangle(Brushes.Wheat,+new+Rectangle(11+-+xx,+22+-+yy,+22,+311));
++++e.Graphics.FillRectangle(Brushes.RosyBrown,+new+Rectangle(11+-+xx,+280+-+yy,+22,+3));
}

private+void+panel1_Scroll(object+sender,+ScrollEventArgs+e)
{
++++panel1.Invalidate();
}|2380246|我已经向Scroll事件添加了一个Invalidate，以避免混乱的绘制结果。|2380247|另一个选项更简单:使您的控件足够大，以容纳所有绘制的控件，并使用AutoScroll=true;将整个滚动任务委托给包含面板的|2380248|a+Panel。|2380249|2380250|entityMap^0|0|0|0|0|0|D|5|K|G|0|9|2|K|5|19|A|0|0|0|0|4|6|H|A|0|W|G|0|2|5|0|0^^$0|@$1|2|3|4|5|6|7|19|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|1A|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|1B|8|@]|9|@]|A|$]]|$1|E|3|F|5|G|7|1C|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|1D|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|1E|8|@$K|1F|L|1G|M|N]|$K|1H|L|1I|M|N]]|9|@]|A|$]]|$1|O|3|P|5|6|7|1J|8|@$K|1K|L|1L|M|Q]|$K|1M|L|1N|M|N]|$K|1O|L|1P|M|N]]|9|@]|A|$]]|$1|R|3|S|5|T|7|1Q|8|@]|9|@]|A|$U|V]]|$1|W|3|X|5|6|7|1R|8|@]|9|@]|A|$]]|$1|Y|3|Z|5|T|7|1S|8|@]|9|@]|A|$U|V]]|$1|10|3|11|5|6|7|1T|8|@$K|1U|L|1V|M|N]|$K|1W|L|1X|M|N]]|9|@]|A|$]]|$1|12|3|13|5|6|7|1Y|8|@$K|1Z|L|20|M|N]]|9|@]|A|$]]|$1|14|3|15|5|G|7|21|8|@$K|22|L|23|M|N]]|9|@]|A|$]]|$1|16|3|-4|5|6|7|24|8|@]|9|@]|A|$]]|$1|17|3|-4|5|6|7|25|8|@]|9|@]|A|$]]]|18|$]]

You have two options.

The good new is that it is possible and both are not really hard.

<ul>
<li>The bad new is that for one option you will have to adapt all your drawing code:</li>
</ul>

First make your Control, I use a <code>Panel</code>, to have <code>Autoscroll=true;</code>

Then you need to add one dummy control, I use another <code>Panel</code>, maybe like this, far enough to the right and bottom to force the <code>ScrollBars</code> to show:

<pre><code>public Form1()
{
 InitializeComponent();

 Panel panelDummy = new Panel();
 panelDummy.Size = new Size(1,1);
 panelDummy.Location = new Point(yourMaxX,yourMaxY);
 panel1.Controls.Add(panelDummy);
}
</code></pre>

And then you need to adapt your drawing code. Here is how:

<pre><code>private void panel1_Paint(object sender, PaintEventArgs e)
{
 int xx = panel1.HorizontalScroll.Value;
 int yy = panel1.VerticalScroll.Value;

 e.Graphics.FillRectangle(Brushes.Wheat, new Rectangle(11 - xx, 22 - yy, 22, 311));
 e.Graphics.FillRectangle(Brushes.RosyBrown, new Rectangle(11 - xx, 280 - yy, 22, 3));
}

private void panel1_Scroll(object sender, ScrollEventArgs e)
{
 panel1.Invalidate();
}
</code></pre>

I have added an <code>Invalidate</code> to the <code>Scroll</code> event to avoid messed up painting results.

<ul>
<li>The other option is simpler: Make your control large enough to hold all your drawn controls and the put it inside a <code>Panel</code> with <code>AutoScroll=true;</code> this will delegate the whole scrolling business to the containing Panel.</li>
</ul>

blocks|key|2380278|text|如果您的自定义控件继承自Panel控件，则只需通过此设置在自定义控件中自行设置内容的大小：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2380279|this.AutoScrollMinSize+=+New+Size(yourWidth,+yourHeight);|code-block|syntax|javascript|2380280|如果你的控件的ClientSize.Height大于yourHeight，你将不会得到任何滚动条。如果小于这个值，你就会得到一个滚动条。|2380281|在paint方法中，将以下内容添加到开头：|2380282|protected+override+void+OnPaint(PaintEventArgs+e)+{
++e.Graphics.TranslateTransform(this.AutoScrollPosition.X,
++++++++++++++++++++++++++++++++this.AutoScrollPosition.Y);|2380283|现在，您绘制的所有内容都会自动转换为滚动坐标。|2380284|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|T|8|@]|9|@]|A|$]]|$1|K|3|L|5|D|7|U|8|@]|9|@]|A|$E|F]]|$1|M|3|N|5|6|7|V|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

If your custom control inherits from the Panel control, you just set the size of the content yourself in the custom control by this setting:

<pre><code>this.AutoScrollMinSize = New Size(yourWidth, yourHeight);
</code></pre>

If your control's ClientSize.Height is greater than yourHeight, you won't get any scrollbars. If it's less, then you get a scrollbar.

In your paint method, add this to the beginning:

<pre><code>protected override void OnPaint(PaintEventArgs e) {
 e.Graphics.TranslateTransform(this.AutoScrollPosition.X,
 this.AutoScrollPosition.Y);
</code></pre>

Now everything you paint gets automatically transformed to the scrolling coordinates.

blocks|key|470128|text|我已经通过创建一个自定义控件部分解决了这个问题，该控件继承自控件，并且完全在OnPaint中绘制。到目前为止，我的解决方案是使用ScrollBarRenderer绘制滚动按钮，然后为可滚动区域定义一个矩形。然后，我创建了一个用于绘制可滚动内容的图像，并在使用DrawImage绘制到我创建的可滚动内容矩形之前，使用TranslateTransform将该图像滚动到适当的位置。它显示了它的前景，尽管我还没有让它完全工作，因为我必须自己处理所有的MouseOver和Click事件。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|470129|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

I've partially solved this problem by creating a custom control that inherits from Control and that is completely drawn in OnPaint. My solution so far is to use ScrollBarRenderer to draw my scroll buttons, then I define a Rectangle for the scrollable area. I then create an Image to draw my scrollable content onto, and use TranslateTransform Scroll that Image into position before using DrawImage to draw into the Scrollable Content Rectangle that I created. It's showing promise, although I haven't gotten it completely working yet since I have to handle all of the MouseOver and Click events on my own.

How do I implement scrolling for my Custom Control? My control is fully custom drawn and its height is variable, and a part of the control contains a menu so if there are many items in the control, I'll need to be able to put scroll bars there. I've not really been able to find any clues on how to do this. I did see something about <code>ScrollableControl</code>, but I'm still not sure if that's what I need.

Also, how will my control know when it needs to show the scroll bars? Because my control is fully custom drawn so there's no real "controls" in there it's just a bunch of pixels that are drawn onto it so it's not like I can just set AutoScroll to true and I can't do that anyway because it's not the main part of the control that needs scrolling, it's a particular location on the control that will need to have the scrollbars.

How do I implement scrolling for a Custom Control?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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如何实现自定义控件的滚动？我的控件是完全自定义绘制的，它的高度是可变的，并且控件的一部分包含一个菜单，所以如果控件中有许多项，我需要能够将滚动条放在那里。我真的找不到任何关于如何做到这一点的线索。我确实看到了一些关于ScrollableControl的东西，但我仍然不确定这是否是我需要的。另外，我的控件如何知道什么时候...

问如何实现自定义控件的滚动？
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