C＃和箭头键 [英] C# and Arrow Keys

问题描述

我是新的C＃和我做了一些工作在现有的应用程序。我有一个具有成分在里面，我希望能够使用箭头键来定位的DirectX视口。

I am new to C# and am doing some work in an existing application. I have a DirectX viewport that has components in it that I want to be able to position using arrow keys.

目前，我重写ProcessCmdKey和醒目的箭头输入和发送的OnKeyPress事件。这工作，但我希望能够用改性剂（ <大骨节病> ALT + <大骨节病> CTRL + <大骨节病> SHIFT ）。当我捧着改性剂和按箭头没有事件被触发，我听着。

Currently I am overriding ProcessCmdKey and catching arrow input and send an OnKeyPress event. This works, but I want to be able to use modifiers(ALT+CTRL+SHIFT). As soon as I am holding a modifier and press an arrow no events are triggered that I am listening to.

有没有人有我应该去的地方的任何意见或建议此？

Does anyone have any ideas or suggestions on where I should go with this?

推荐答案

在您的覆盖ProcessCmdKey你是如何确定哪些键被按下？

Within your overridden ProcessCmdKey how are you determining which key has been pressed?

价值KEYDATA（第二个参数）将改变依赖按下键和任何修饰键，因此，例如，按下左箭头将返回码37，左移位将返回65573，CTRL-左131109和ALT左262181。

The value of keyData (the second parameter) will change dependant on the key pressed and any modifier keys, so, for example, pressing the left arrow will return code 37, shift-left will return 65573, ctrl-left 131109 and alt-left 262181.

您可以提取修饰符和AND运算适当枚举值按该键：

You can extract the modifiers and the key pressed by ANDing with appropriate enum values:

protected override bool ProcessCmdKey(ref Message msg, Keys keyData)
{
    bool shiftPressed = (keyData & Keys.Shift) != 0;
    Keys unmodifiedKey = (keyData & Keys.KeyCode);

    // rest of code goes here
}

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