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80 lines
2.0 KiB
Markdown
80 lines
2.0 KiB
Markdown
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# 如何使用对话框
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对话框有模态和非模态两种,具体用法如下:
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## 非模态对话框
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非模态对话框的使用方法与普通窗口完全一样,只是对话框的大小和位置可以改变。通常情况下,尽量使用非模态对话框。
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示例:
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>完整代码请参考: [awtk-c-demos/demos/normal_dialog.c](https://github.com/zlgopen/awtk-c-demos/blob/master/demos/normal_dialog.c)
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```c
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static ret_t on_yes(void* ctx, event_t* e) {
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tk_quit();
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return RET_OK;
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}
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static ret_t on_no(void* ctx, event_t* e) {
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window_close(widget_get_window(WIDGET(e->target)));
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return RET_OK;
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}
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static ret_t on_open_dialog(void* ctx, event_t* e) {
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widget_t* dlg = dialog_create_simple(NULL, 0, 0, 240, 160);
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...
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return RET_OK;
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}
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```
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## 模态对话框
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对于模态对话框,需要调用函数 dialog\_modal 等待对话框退出,dialog\_modal 函数会阻塞直到 dialog\_quit 被调用。
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在点击某个按钮时,如果要关闭对话框,一定要通过 dialog\_quit 函数,不能直接关闭对话框!!!
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示例:
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>完整代码请参考: [awtk-c-demos/demos/modal_dialog.c](https://github.com/zlgopen/awtk-c-demos/blob/master/demos/modal_dialog.c)
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```c
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static ret_t on_yes(void* ctx, event_t* e) {
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dialog_quit(widget_get_window(WIDGET(e->target)), DIALOG_QUIT_YES);
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return RET_OK;
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}
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static ret_t on_no(void* ctx, event_t* e) {
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dialog_quit(widget_get_window(WIDGET(e->target)), DIALOG_QUIT_NO);
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return RET_OK;
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}
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static ret_t on_open_dialog(void* ctx, event_t* e) {
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int code = 0;
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...
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code = dialog_modal(dlg);
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if(code == DIALOG_QUIT_YES) {
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tk_quit();
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}
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return RET_OK;
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}
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```
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在上面的代码中,下面的代码不会被执行,直到按钮被点击,然后调用 dialog_quit。
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```c
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if(code == DIALOG_QUIT_YES)
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```
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对于模态对话框来说,在确认按钮的事件处理函数中,除了调用 dialog_quit 函数,什么都别做!处理逻辑放到 dialog\_modal 之后,根据 dialog\_modal 的返回值决定下一步如何做。
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