GtkTreeView

在看這篇之前,請先看過 GtkComboBox 與 GtkListStore ,由於以Model-View的方式設計,您可以在不修改Model的情況下,為Model換上另一個顯示的外觀(View),例如為 GtkComboBox 與 GtkListStore 範例中建立的GtkListStore換上GtkTreeView的外觀。

具體來說,也就是該範例中的createModel()內容無需改變,將GtkComboBox的相對應程式碼,換成建立GtkTreeView的程式碼,例如:
GtkWidget *treeView = gtk_tree_view_new_with_model(createModel());
GtkCellRenderer *renderer = gtk_cell_renderer_pixbuf_new();
GtkTreeViewColumn *column = gtk_tree_view_column_new_with_attributes(
"Icon", renderer,
"pixbuf", PIXBUF_COL,
NULL);
gtk_tree_view_append_column(GTK_TREE_VIEW (treeView), column);

renderer = gtk_cell_renderer_text_new();
column = gtk_tree_view_column_new_with_attributes(
"Filename", renderer,
"text", TEXT_COL,
NULL);
gtk_tree_view_append_column(GTK_TREE_VIEW (treeView), column);

GtkTreeViewColumn是GtkTreeView中的列代表,可用以設定該列的內容如何 繪製以及一些相關屬性,基本上以上程式片段中,gtk_tree_view_column_new_with_attributes()與 gtk_tree_view_append_column()函式可以用 gtk_tree_view_insert_column_with_attributes()函式來簡化,也就是可以簡化為:
GtkWidget *treeView = gtk_tree_view_new_with_model(createModel());
GtkCellRenderer * renderer = gtk_cell_renderer_pixbuf_new();
gtk_tree_view_insert_column_with_attributes(
GTK_TREE_VIEW(treeView), -1, "Icon", renderer,
"pixbuf", PIXBUF_COL,
NULL);

renderer = gtk_cell_renderer_text_new();
gtk_tree_view_insert_column_with_attributes(
GTK_TREE_VIEW(treeView), -1, "Filename", renderer,
"text", TEXT_COL,
NULL);

在GtkTreeView當中的選擇,是以為個GtkTreeSelection物件作代表,當選擇改變時,會發出"changed"的Signal,所以要連結Signal與Callback函式,可以如下進行:
GtkTreeSelection *selection = gtk_tree_view_get_selection(GTK_TREE_VIEW(treeView));
g_signal_connect(G_OBJECT(selection), "changed",
G_CALLBACK(selection_changed), label);

至於Callback函式的部份大同小異,您要從傳遞的GtkTreeSelection中取得GtkTreeView,從GtkTreeView中取得 GtkTreeModel,再使用gtk_tree_selection_get_selected()將GtkTreeIter指向選中的列,以取得您 想取得的欄位資料:
gboolean selection_changed(GtkTreeSelection *selection, GtkLabel *label) {
GtkTreeView *treeView;
GtkTreeModel *model;
GtkTreeIter iter;
gchar *active;

treeView = gtk_tree_selection_get_tree_view(selection);
model = gtk_tree_view_get_model(treeView);
gtk_tree_selection_get_selected(selection, &model, &iter);
gtk_tree_model_get(model, &iter,
1, &active,
-1);

gtk_label_set_text(label, active);
}

下面的範例是以上說明的綜合示範:
  • gtk_tree_view_demo.c
#include <gtk/gtk.h>

enum {
PIXBUF_COL,
TEXT_COL
};

GtkTreeModel* createModel() {
const gchar *files[] = {"caterpillar.jpg", "momor.jpg",
"hamimi.jpg", "bush.jpg"};
GdkPixbuf *pixbuf;
GtkTreeIter iter;
GtkListStore *store;
gint i;

store = gtk_list_store_new(2, GDK_TYPE_PIXBUF, G_TYPE_STRING);

for(i = 0; i < 4; i++) {
pixbuf = gdk_pixbuf_new_from_file(files[i], NULL);
gtk_list_store_append(store, &iter);
gtk_list_store_set(store, &iter,
PIXBUF_COL, pixbuf,
TEXT_COL, files[i],
-1);
gdk_pixbuf_unref(pixbuf);
}

return GTK_TREE_MODEL(store);
}

gboolean selection_changed(GtkTreeSelection *selection, GtkLabel *label) {
GtkTreeView *treeView;
GtkTreeModel *model;
GtkTreeIter iter;
gchar *active;

treeView = gtk_tree_selection_get_tree_view(selection);
model = gtk_tree_view_get_model(treeView);
gtk_tree_selection_get_selected(selection, &model, &iter);
gtk_tree_model_get(model, &iter,
1, &active,
-1);

gtk_label_set_text(label, active);
}

int main(int argc, char *argv[]) {
GtkWidget *window;
GtkWidget *treeView;
GtkCellRenderer *renderer;
GtkTreeViewColumn *column;
GtkWidget *label;
GtkWidget *vbox;
GtkTreeSelection *selection;

gtk_init(&argc, &argv);

window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
gtk_window_set_title(GTK_WINDOW(window), "GtkTreeView");
gtk_window_set_default_size(GTK_WINDOW(window), 200, 50);

treeView = gtk_tree_view_new_with_model(createModel());

renderer = gtk_cell_renderer_pixbuf_new();
column = gtk_tree_view_column_new_with_attributes(
"Icon", renderer,
"pixbuf", PIXBUF_COL,
NULL);
gtk_tree_view_append_column(GTK_TREE_VIEW (treeView), column);

renderer = gtk_cell_renderer_text_new();
column = gtk_tree_view_column_new_with_attributes(
"Filename", renderer,
"text", TEXT_COL,
NULL);
gtk_tree_view_append_column(GTK_TREE_VIEW (treeView), column);

label = gtk_label_new("caterpillar.jpg");
vbox = gtk_vbox_new(FALSE, 5);

gtk_box_pack_start(GTK_BOX(vbox), treeView, TRUE, TRUE, 5);
gtk_box_pack_start(GTK_BOX(vbox), label, TRUE, TRUE, 5);
gtk_container_add(GTK_CONTAINER(window), vbox);

selection = gtk_tree_view_get_selection(GTK_TREE_VIEW(treeView));
g_signal_connect(G_OBJECT(selection), "changed",
G_CALLBACK(selection_changed), label);

g_signal_connect(GTK_OBJECT(window), "destroy",
G_CALLBACK(gtk_main_quit), NULL);

gtk_widget_show_all(window);

gtk_main();

return 0;
}


一個執行的結果畫面如下所示:

有了以上的基礎,要在GtkTreeView搭配GtkTreeStore就沒什麼好解釋的了,下面這個範例,只是將範例中的createModel()函式,換成 GtkComboBox 與 GtkTreeStore 中的createModel()函式,剩下的都沒有改變,也就是為 GtkComboBox 與 GtkTreeStore 中的Model換上GtkTreeView的外觀顯示

  • gtk_tree_view_with_tree_store.c
#include <gtk/gtk.h>

enum {
PIXBUF_COL,
TEXT_COL
};

GtkTreeModel* createModel() {
const gchar *files[] = {"caterpillar.jpg", "momor.jpg",
"hamimi.jpg", "bush.jpg"};
gchar *stocks[] = {
GTK_STOCK_DIALOG_WARNING,
GTK_STOCK_STOP,
GTK_STOCK_NEW,
GTK_STOCK_CLEAR,
GTK_STOCK_OPEN
};

gchar *stockNames[] = {
"WARNING",
"STOP",
"NEW",
"GTK_STOCK_CLEAR",
"GTK_STOCK_OPEN"
};

GtkWidget *cellView;
GdkPixbuf *pixbuf;
GtkTreeIter iter1, iter2;
GtkTreeStore *store;
gint i, j, s;

store = gtk_tree_store_new(2, GDK_TYPE_PIXBUF, G_TYPE_STRING);
cellView = gtk_cell_view_new();
for(i = 0; i < 4; i++) {
pixbuf = gdk_pixbuf_new_from_file(files[i], NULL);
gtk_tree_store_append(store, &iter1, NULL);
gtk_tree_store_set(store, &iter1,
PIXBUF_COL, pixbuf,
TEXT_COL, files[i],
-1);
gdk_pixbuf_unref(pixbuf);

for(j = 0; j < 3; j++) {
s = rand() % 5;
pixbuf = gtk_widget_render_icon(cellView, stocks[s],
GTK_ICON_SIZE_BUTTON, NULL);
gtk_tree_store_append(store, &iter2, &iter1);
gtk_tree_store_set(store, &iter2,
PIXBUF_COL, pixbuf,
TEXT_COL, stockNames[s],
-1);
gdk_pixbuf_unref(pixbuf);
}
}

return GTK_TREE_MODEL(store);
}

gboolean selection_changed(GtkTreeSelection *selection, GtkLabel *label) {
GtkTreeView *treeView;
GtkTreeModel *model;
GtkTreeIter iter;
gchar *active;

treeView = gtk_tree_selection_get_tree_view(selection);
model = gtk_tree_view_get_model(treeView);
gtk_tree_selection_get_selected(selection, &model, &iter);
gtk_tree_model_get(model, &iter,
1, &active,
-1);

gtk_label_set_text(label, active);
}

int main(int argc, char *argv[]) {
GtkWidget *window;
GtkWidget *treeView;
GtkCellRenderer *renderer;
GtkTreeViewColumn *column;
GtkWidget *label;
GtkWidget *vbox;
GtkTreeSelection *selection;

gtk_init(&argc, &argv);

window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
gtk_window_set_title(GTK_WINDOW(window), "GtkTreeView");
gtk_window_set_default_size(GTK_WINDOW(window), 200, 50);

treeView = gtk_tree_view_new_with_model(createModel());

renderer = gtk_cell_renderer_pixbuf_new();
column = gtk_tree_view_column_new_with_attributes(
"Icon", renderer,
"pixbuf", PIXBUF_COL,
NULL);
gtk_tree_view_append_column(GTK_TREE_VIEW (treeView), column);

renderer = gtk_cell_renderer_text_new();
column = gtk_tree_view_column_new_with_attributes(
"Filename", renderer,
"text", TEXT_COL,
NULL);
gtk_tree_view_append_column(GTK_TREE_VIEW (treeView), column);

label = gtk_label_new("caterpillar.jpg");
vbox = gtk_vbox_new(FALSE, 5);

gtk_box_pack_start(GTK_BOX(vbox), treeView, TRUE, TRUE, 5);
gtk_box_pack_start(GTK_BOX(vbox), label, TRUE, TRUE, 5);
gtk_container_add(GTK_CONTAINER(window), vbox);

selection = gtk_tree_view_get_selection(GTK_TREE_VIEW(treeView));
g_signal_connect(G_OBJECT(selection), "changed",
G_CALLBACK(selection_changed), label);

g_signal_connect(GTK_OBJECT(window), "destroy",
G_CALLBACK(gtk_main_quit), NULL);

gtk_widget_show_all(window);

gtk_main();

return 0;
}

一個執行的結果如下所示:

你可能感兴趣的:(J#)