How to check if a ctrl + enter is pressed on a control? 通過注冊ComponentDispatcher.ThreadPreprocessMessage 事件實現(xiàn)。

// Registering against a stack event will cause memory leak, please unregister this event when you are done with it.

ComponentDispatcher.ThreadPreprocessMessage += ComponentDispatcher_ThreadPreprocessMessage;

// WM_KEYDOWN 是按下一個鍵是產(chǎn)生的消息。
const

int WM_KEYDOWN = 0x100;
// WM_SYSKEYDOWN 是按下Alt鍵同時再按下別的鍵時產(chǎn)生的消息。
const int WM_SYSKEYDOWN = 0x0104;

void ComponentDispatcher_ThreadPreprocessMessage(ref MSG msg, ref bool handled)

{

??????if (msg.message == WM_KEYDOWN || msg.message == WM_SYSKEYDOWN)

??????{

?????????// Examine if the Control and Enter keys are pressed, we also need to make sure that the?
????????// currently keyborad focused element is TextBox instance itself.?
??????? // "|" 二進(jìn)制或運(yùn)算，有一個為1則結(jié)果為1。
??????? // "&" 二進(jìn)制與運(yùn)算，兩個都為1則結(jié)果為1. Keys轉(zhuǎn)換為int的值就是Keys這個枚舉類中定義的該枚舉項的值。

?????????Keys keyData = ((Keys)((int)(msg.wParam))) | System.Windows.Forms.Control.ModifierKeys;

?????????if (((keyData & Keys.Control) == Keys.Control) &&

?????????((keyData & Keys.Enter) == Keys.Enter) &&

?????????Keyboard.FocusedElement == this.txtBox)

?????????{

???????????????System.Windows.MessageBox.Show("Ctrl+Enter is pressed");

?????????}

??????}
}

posted on 2008-08-22 16:24 cutebear 閱讀(...) 評論(...) 編輯 收藏

轉(zhuǎn)載于:https://www.cnblogs.com/bear831204/archive/2008/08/22/1273188.html

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