我想在 winforms 列表框控件中检测项目双击.[如何处理点击空白区域?]

问题描述

我有一个列表框，里面有一些项目.
我想检测一个项目的双击.
目前我使用的方法有一个问题，如果用户双击一个空白点，则当前选定的项目被指示为双击.

well i have a listbox with some items inside.
i want to detect a double click on an item.
currently the method i am using have a problem that if a user double click on an empty spot the currently selected item is signaled as double clicked.

更新:
请注意，这个问题并不像起初看起来那么简单.
另请注意，Timwi 的答案不正确，因为如果选择了一个项目并且我在空白处单击，则 [if (ListBox1.SelectedIndex == -1)] 部分不会执行我不知道谁支持他，但他的回答不正确.
我已经编写了这部分代码
如果有可以将鼠标坐标转换为列表框项的功能，那么问题将得到解决

Update:
Please note that this question is not as easy as it seems at first.
also note that Timwi answer is not correct because the [if (ListBox1.SelectedIndex == -1)] part dont get executed if there is an item selected and i clicked in an empty space i dont know who upvoted him but his answer is not correct.
i already had this part of code written
if there is a function that can convert mouse coordinates to a listbox item then the problem will be fixed

推荐答案

还有一个替代事件:MouseDoubleClick，它提供了MouseEventArgs，所以可以获取点击坐标.然后您可以调用 GetItemBounds() 来获取包含所选项目的矩形并检查鼠标坐标是否在此矩形内:

There is an alternative event: MouseDoubleClick, which provides MouseEventArgs, so you can get click coordinates. Then you can call GetItemBounds() to get rectangle, containing selected item and check if mouse coordinates are within this rectangle:

    private void listBox1_MouseDoubleClick(object sender, MouseEventArgs e)
    {
        if(listBox1.SelectedIndex != -1)
        {
            var rect = listBox1.GetItemRectangle(listBox1.SelectedIndex);
            if(rect.Contains(e.Location))
            {
                // process item data here
            }
        }
    }

MouseDoubleClick版本信息:

• .NET Framework - 支持:4、3.5、3.0、2.0
• .NET Framework 客户端配置文件 - 受以下版本支持:4、3.5 SP1

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