gtk+修改控件文本字体一例
来源：互联网 发布：编程数学基础 编辑：程序博客网 时间：2024/06/05 05:04
因为家里电脑是Mac系统，所以就拿Mac系统来示范。
要注意的是gtk+2.0和3.0对字体的处理是有一些区别的：
1.后者使用的是pango的机制，我们这里以gtk+3.0为基础。
2.两者调用Font对话框的方法也不一样，前者用gtk_font_selection_dialog_new来建立对话框，还要设置button_ok按钮的回调函数，比较繁琐；后者用gtk_font_chooser_dialog_new建立对话框，可以直接取得字体名称，比较简洁。这里同样以3.0为基础。
下面上代码：
#include <gtk/gtk.h>#include <string.h>#define UI_PATH "./entry.ui"#define MAIN_WINDOW "window"#define ENTRY "entry"#define CHK_EDITABLE "chk_editable"#define CHK_VISIBLE "chk_visible"static GtkWidget *w;static GtkWidget *s_entry;static GtkWidget *s_dialog_font = NULL;void font_selection_ok(GtkWidget *button,gpointer user_data){ GtkStyle *style; //GdkFont *font; //gchar *font_name = gtk_font_selection_dialog_get_font_name(GTK_IS_FONT_SELECTION_DIALOG(s_dialog_font)); //printf("%s:font_name is %s\n",__func__,font_name); /* font = gtk_font_selection_dialog_get_font(GTK_IS_FONT_SELECTION_DIALOG(s_dialog_font)); if(font){ style = gtk_style_copy(gtk_widget_get_style(s_entry)); gdk_font_unref(style->font); style->font = font; gdk_font_ref(style->font); gtk_widget_set_style(s_entry,style); } */}void font_changed(GtkWidget *self,gpointer user_data){ s_dialog_font = gtk_font_chooser_dialog_new("Font Selection Dialog :)",GTK_WINDOW(w)); gtk_window_set_transient_for(GTK_WINDOW(s_dialog_font),GTK_WINDOW(w)); gtk_window_set_destroy_with_parent(GTK_WINDOW(s_dialog_font),TRUE); gtk_font_chooser_set_font(GTK_FONT_CHOOSER(s_dialog_font),NULL); if(gtk_dialog_run(GTK_DIALOG(s_dialog_font)) == GTK_RESPONSE_OK){ gchar *font_name = gtk_font_chooser_get_font(GTK_FONT_CHOOSER(s_dialog_font)); printf("%s:font_name is %s\n",__func__,font_name); PangoFontDescription *pfd = pango_font_description_from_string(font_name); //gtk_widget_modify_font(s_entry,pfd); gtk_widget_override_font(s_entry,pfd); pango_font_description_free(pfd); } gtk_widget_destroy(s_dialog_font);/* if(!s_dialog_font){ s_dialog_font = gtk_font_selection_dialog_new("Font Selection Dialog :)"); g_return_if_fail(GTK_IS_FONT_SELECTION_DIALOG(s_dialog_font)); //gtk_window_position(GTK_WINDOW(s_dialog_font),GTK_WIN_POS_MOUSE); gtk_window_set_position(GTK_WINDOW(s_dialog_font),GTK_WIN_POS_MOUSE); g_signal_connect(s_dialog_font,"destroy", G_CALLBACK(gtk_widget_destroyed),&s_dialog_font); g_signal_connect(gtk_font_selection_dialog_get_ok_button( GTK_IS_FONT_SELECTION_DIALOG(s_dialog_font)), "clicked",G_CALLBACK(font_selection_ok),NULL); g_signal_connect_swapped(gtk_font_selection_dialog_get_cancel_button( GTK_IS_FONT_SELECTION_DIALOG(s_dialog_font)), "clicked",G_CALLBACK(gtk_widget_destroy),s_dialog_font); } //if(!GTK_WIDGET_VISIBLE(s_dialog_font)) if(!gtk_widget_get_visible(s_dialog_font)) gtk_widget_show(s_dialog_font); else gtk_widget_destroy(s_dialog_font);*/}void editable_toggled(GtkWidget *self,GtkEntry *entry){ //gtk_entry_set_editable(entry,GTK_TOGGLE_BUTTON(self)->active); printf("%s:enter function\n",__func__); gtk_editable_set_editable((GtkEditable*)entry,gtk_toggle_button_get_active( GTK_TOGGLE_BUTTON(self)));}void visible_toggled(GtkWidget *self,GtkEntry *entry){ //gtk_entry_set_visibility(entry,GTK_TOGGLE_BUTTON(self)->active); printf("%s:enter function\n",__func__); gtk_entry_set_visibility(entry,gtk_toggle_button_get_active(GTK_TOGGLE_BUTTON(self)));}void entry_changed(GtkWidget *self,gpointer user_data){ gchar *text = (gchar*)gtk_entry_get_text(GTK_ENTRY(self)); printf("%s:text is %s\n",__func__,text); text = g_ascii_strup(text,strlen(text)); gtk_entry_set_text(GTK_ENTRY(self),text);}int main(int argc,char **argv){ //GtkWidget *w; GError *error = NULL; gtk_init(&argc,&argv); GtkBuilder *builder = gtk_builder_new(); if(!gtk_builder_add_from_file(builder,UI_PATH,&error)){ g_critical("Couldn't load builder file: %s",error->message); g_error_free(error); } w = GTK_WIDGET(gtk_builder_get_object(builder,MAIN_WINDOW)); if(!w){ g_critical("Widget \"%s\" is missing in file %s",MAIN_WINDOW,UI_PATH); } gtk_window_set_title(GTK_WINDOW(w),"clist todo list"); gtk_window_set_default_size(GTK_WINDOW(w),300,100); gtk_window_set_position(GTK_WINDOW(w),GTK_WIN_POS_CENTER_ALWAYS); gtk_container_set_border_width(GTK_CONTAINER(w),5); s_entry = GTK_WIDGET(gtk_builder_get_object(builder,ENTRY)); gtk_builder_connect_signals(builder,NULL); g_object_unref(builder); gtk_widget_show_all(w); gtk_main(); return 0;}entry.ui文件:
<?xml version="1.0" encoding="UTF-8"?><!-- Generated with glade 3.18.3 --><interface> <requires lib="gtk+" version="3.12"/> <object class="GtkWindow" id="window"> <property name="height_request">100</property> <property name="can_focus">False</property> <signal name="destroy" handler="gtk_main_quit" swapped="no"/> <child> <object class="GtkBox" id="box1"> <property name="visible">True</property> <property name="can_focus">False</property> <property name="orientation">vertical</property> <property name="spacing">10</property> <child> <object class="GtkGrid" id="grid1"> <property name="visible">True</property> <property name="can_focus">False</property> <property name="column_spacing">5</property> <property name="column_homogeneous">True</property> <child> <object class="GtkLabel" id="label1"> <property name="visible">True</property> <property name="can_focus">False</property> <property name="label" translatable="yes">大写化</property> </object> <packing> <property name="left_attach">0</property> <property name="top_attach">0</property> </packing> </child> <child> <object class="GtkEntry" id="entry"> <property name="visible">True</property> <property name="can_focus">True</property> <property name="max_width_chars">50</property> <property name="shadow_type">etched-out</property> <property name="progress_pulse_step">0.089999999999999997</property> <property name="secondary_icon_stock">gtk-help</property> <property name="secondary_icon_tooltip_markup" translatable="yes">输入文本自动转换为大写</property> <signal name="changed" handler="entry_changed" swapped="no"/> </object> <packing> <property name="left_attach">1</property> <property name="top_attach">0</property> <property name="width">2</property> </packing> </child> <child> <object class="GtkButton" id="btn_font"> <property name="label">gtk-select-font</property> <property name="visible">True</property> <property name="can_focus">True</property> <property name="receives_default">True</property> <property name="use_stock">True</property> <signal name="clicked" handler="font_changed" swapped="no"/> </object> <packing> <property name="left_attach">3</property> <property name="top_attach">0</property> </packing> </child> </object> <packing> <property name="expand">False</property> <property name="fill">True</property> <property name="position">0</property> </packing> </child> <child> <object class="GtkBox" id="box2"> <property name="visible">True</property> <property name="can_focus">False</property> <property name="homogeneous">True</property> <child> <object class="GtkAlignment" id="alignment1"> <property name="visible">True</property> <property name="can_focus">False</property> <property name="xscale">0</property> <property name="yscale">0</property> <child> <object class="GtkCheckButton" id="chk_editable"> <property name="label" translatable="yes">Editable</property> <property name="visible">True</property> <property name="can_focus">True</property> <property name="receives_default">False</property> <property name="xalign">0</property> <property name="active">True</property> <property name="draw_indicator">True</property> <signal name="toggled" handler="editable_toggled" object="entry" swapped="no"/> </object> </child> </object> <packing> <property name="expand">False</property> <property name="fill">True</property> <property name="position">0</property> </packing> </child> <child> <object class="GtkAlignment" id="alignment2"> <property name="visible">True</property> <property name="can_focus">False</property> <property name="xscale">0</property> <property name="yscale">0</property> <child> <object class="GtkCheckButton" id="chk_visible"> <property name="label" translatable="yes">Visible</property> <property name="visible">True</property> <property name="can_focus">True</property> <property name="receives_default">False</property> <property name="xalign">0</property> <property name="active">True</property> <property name="draw_indicator">True</property> <signal name="toggled" handler="visible_toggled" object="entry" swapped="no"/> </object> </child> </object> <packing> <property name="expand">False</property> <property name="fill">True</property> <property name="position">1</property> </packing> </child> </object> <packing> <property name="expand">False</property> <property name="fill">True</property> <property name="position">1</property> </packing> </child> <child> <object class="GtkAlignment" id="alignment3"> <property name="visible">True</property> <property name="can_focus">False</property> <property name="xscale">0.5</property> <property name="yscale">0</property> <child> <object class="GtkButton" id="btn_ok"> <property name="label" translatable="yes">O K</property> <property name="visible">True</property> <property name="can_focus">True</property> <property name="receives_default">True</property> <signal name="clicked" handler="gtk_main_quit" swapped="yes"/> </object> </child> </object> <packing> <property name="expand">False</property> <property name="fill">True</property> <property name="position">2</property> </packing> </child> </object> </child> </object></interface>运行效果如下：
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