ftk学习记(对话框篇)
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前面谈到了输入法,首先看一看效果。
上面有4个输入框,大家能够分别试试,看看效果怎样。
今天,我们要说的是对话框。直接看demo代码好了,
#include "ftk.h" static Ret button_quit_clicked(void* ctx, void* obj) { if(ctx != NULL) { /*modal*/ *(int*)ctx = ftk_widget_id(obj); } else { /*modal-less*/ ftk_widget_unref(ftk_widget_toplevel(obj)); } return RET_QUIT; } static Ret button_close_clicked(void* ctx, void* obj) { ftk_widget_unref(ctx); return RET_OK; } static Ret button_dialog_clicked(void* ctx, void* obj) { int id = 0; int width = 0; int height = 0; FtkWidget* label = NULL; FtkWidget* button = NULL; FtkWidget* dialog = NULL; FtkBitmap* icon = NULL; int modal = (int)ctx; ftk_logd("%s:%d begin\n", __func__, __LINE__); dialog = ftk_dialog_create(0, 40, 320, 240); icon = ftk_theme_load_image(ftk_default_theme(), "info-icon"FTK_STOCK_IMG_SUFFIX); ftk_dialog_set_icon(dialog, icon); width = ftk_widget_width(dialog); height = ftk_widget_height(dialog); label = ftk_label_create(dialog, width/6, height/4, 5*width/6, 20); ftk_widget_set_text(label, "Are you sure to quit?"); button = ftk_button_create(dialog, width/6, height/2, width/3, 50); ftk_widget_set_text(button, "yes"); ftk_button_set_clicked_listener(button, button_quit_clicked, modal ? &id : NULL); button = ftk_button_create(dialog, width/2, height/2, width/3, 50); ftk_widget_set_text(button, "no"); ftk_button_set_clicked_listener(button, button_quit_clicked, modal ? &id : NULL); ftk_window_set_focus(dialog, button); ftk_widget_set_text(dialog, modal ? "model dialog" : "normal dialog"); ftk_widget_show_all(dialog, 1); if(modal) { assert(ftk_dialog_run(dialog) == id); ftk_widget_unref(dialog); } else { ftk_widget_show_all(dialog, 1); } ftk_logd("%s:%d end\n", __func__, __LINE__); return RET_OK; } int main(int argc, char* argv[]) { int width = 0; int height = 0; FtkWidget* win = NULL; FtkWidget* button = NULL; ftk_init(argc, argv); win = ftk_app_window_create(); width = ftk_widget_width(win); height = ftk_widget_height(win); button = ftk_button_create(win, 0, height/6, width/3, 50); ftk_widget_set_text(button, "Normal"); ftk_button_set_clicked_listener(button, button_dialog_clicked, NULL); button = ftk_button_create(win, 2*width/3, height/6, width/3, 50); ftk_widget_set_text(button, "Modal"); ftk_button_set_clicked_listener(button, button_dialog_clicked, (void*)1); button = ftk_button_create(win, width/4, height/2, width/2, 60); ftk_widget_set_text(button, "quit"); ftk_button_set_clicked_listener(button, button_close_clicked, win); ftk_widget_set_text(win, "demo dialog"); ftk_widget_show_all(win, 1); ftk_widget_set_attr(win, FTK_ATTR_QUIT_WHEN_CLOSE); ftk_run(); return 0; }
这段对话框的代码略微长一点,可是理解上没有难度。首先,main代码中创建了3个button。除了一个quit的button之外,其它两个button都是用来弹出对话框使用的,两个button的回调函数都是button_dialog_clicked。那么这当中又做了些什么呢?我们继续往下看,首先它会调用ftk_create_dialog创建一个对话框,然后用ftk_dialog_set_icon设置一下icon,接着依次创建了label和button,就是这样。怎样退出对话框呢?仅仅须要单击一下dialog中的button就可以,它会调用button_close_clicked函数,此时ftk_widget_unref会帮我们退出当前dialog,返回之前的windows,就是这么简单。
效果图,下次见。