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39 lines
1019 B
Markdown
39 lines
1019 B
Markdown
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# 如何实现"back"键和"home"键
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* **back键** 关闭当前窗口，回到上一级窗口。
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* **home键** 回到第一个主窗口，并关闭之上的全部窗口。
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1.编写事件处理函数。
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```
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static ret_t on_key_back_or_back_to_home(void* ctx, event_t* e) {
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key_event_t* evt = (key_event_t*)e;
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if (evt->key == TK_KEY_F2) {
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window_manager_back(WIDGET(ctx));
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} else if (evt->key == TK_KEY_F3) {
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window_manager_back_to_home(WIDGET(ctx));
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}
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return RET_OK;
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}
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```
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2.注册窗口管理器的按键事件处理函数：
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```
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widget_t* wm = window_manager();
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widget_on(wm, EVT_KEY_DOWN, on_key_back_or_back_to_home, wm);
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```
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3.把主窗口设置为不可关闭：
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```
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widget_set_prop_str(win, WIDGET_PROP_CLOSABLE, "no");
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```
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请参考完整示例: [multi_windows.c](https://github.com/zlgopen/awtk-c-demos/blob/master/demos/multi_windows.c)
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如果在关闭窗口前，需要用户确认，请参考：[system_bar.md](https://github.com/zlgopen/awtk/blob/master/docs/system_bar.md)
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