Question

如何在qtreewidgetitem中改变背景图标：一些代码示例..

#include <gtk/gtk.h>
#include <glib.h>
#include <stdlib.h>
GtkWidget *scrolledwindow;
struct param
{
    GtkWidget* backbutton;
    GtkWidget* scrolledwindow;
    GtkWidget*newChild;
    GtkWidget*oldChild;
};
GtkWidget * init_tree();
GtkWidget * init_tree2();
static void destroy(GtkWidget *widget, gpointer data)
{
  gtk_main_quit();
}

static void Back (GtkButton *button, gpointer   user_data)
{
      struct param* parameters = (struct param*)user_data;
      gtk_widget_hide(GTK_WIDGET(parameters->scrolledwindow));
      gtk_container_remove(GTK_CONTAINER(parameters->scrolledwindow), GTK_WIDGET(parameters->newChild));
      gtk_container_add(GTK_CONTAINER(parameters->scrolledwindow), parameters->oldChild);
      gtk_widget_hide (GTK_WIDGET(parameters->backbutton));
      gtk_widget_show_all (GTK_WIDGET(parameters->scrolledwindow));
}


static void replace_tab(GtkTreeView *tree_view, GtkTreePath *path, GtkTreeViewColumn *column, gpointer user_data)
{
      struct param* parameters = (struct param*)user_data;
      gtk_widget_hide(GTK_WIDGET(parameters->scrolledwindow));
      gtk_container_remove(GTK_CONTAINER(parameters->scrolledwindow), GTK_WIDGET(tree_view));
      gtk_container_add(GTK_CONTAINER(parameters->scrolledwindow), parameters->newChild);
      gtk_widget_show (GTK_WIDGET(parameters->backbutton));
      gtk_widget_show_all (GTK_WIDGET(parameters->scrolledwindow));
}

GtkWidget * init_tree()
{

    GtkListStore *liststore = gtk_list_store_new(1, G_TYPE_STRING);
    GtkTreeIter treeiter;

    gtk_list_store_append(liststore, &treeiter);
    gtk_list_store_set(liststore, &treeiter, 0, "Mandriva", -1);
    gtk_list_store_append(liststore, &treeiter);
    gtk_list_store_set(liststore, &treeiter, 0, "Aptosid", -1);
    gtk_list_store_append(liststore, &treeiter);
    gtk_list_store_set(liststore, &treeiter, 0, "OpenSuSE", -1);
    gtk_list_store_append(liststore, &treeiter);
    gtk_list_store_set(liststore, &treeiter, 0, "Linux Mint", -1);
    gtk_list_store_append(liststore, &treeiter);
    gtk_list_store_set(liststore, &treeiter, 0, "Arch Linux", -1);
    gtk_list_store_append(liststore, &treeiter);
    gtk_list_store_set(liststore, &treeiter, 0, "Mandriva", -1);
    gtk_list_store_append(liststore, &treeiter);
    gtk_list_store_set(liststore, &treeiter, 0, "Aptosid", -1);
    gtk_list_store_append(liststore, &treeiter);
    gtk_list_store_set(liststore, &treeiter, 0, "OpenSuSE", -1);
    gtk_list_store_append(liststore, &treeiter);
    gtk_list_store_set(liststore, &treeiter, 0, "Linux Mint", -1);
    gtk_list_store_append(liststore, &treeiter);
    gtk_list_store_set(liststore, &treeiter, 0, "Arch Linux", -1);
    GtkWidget *treeview = gtk_tree_view_new_with_model(GTK_TREE_MODEL(liststore));

    GtkCellRenderer *cellrenderertext = gtk_cell_renderer_text_new();

    GtkTreeViewColumn *treeviewcolumn = gtk_tree_view_column_new_with_attributes("Distributions",
                                                                                 cellrenderertext,
                                                                                 "text", 0,
                                                                                 NULL);
    gtk_tree_view_append_column(GTK_TREE_VIEW(treeview), treeviewcolumn);

    return treeview;
}

GtkWidget * init_tree2()
{

    GtkListStore *liststore = gtk_list_store_new(1, G_TYPE_STRING);
    GtkTreeIter treeiter;

    gtk_list_store_append(liststore, &treeiter);
    gtk_list_store_set(liststore, &treeiter, 0, "a", -1);
    gtk_list_store_append(liststore, &treeiter);
    gtk_list_store_set(liststore, &treeiter, 0, "b", -1);
    gtk_list_store_append(liststore, &treeiter);
    gtk_list_store_set(liststore, &treeiter, 0, "c", -1);
    gtk_list_store_append(liststore, &treeiter);
    gtk_list_store_set(liststore, &treeiter, 0, "d", -1);
    gtk_list_store_append(liststore, &treeiter);
    gtk_list_store_set(liststore, &treeiter, 0, "e", -1);
    gtk_list_store_append(liststore, &treeiter);
    gtk_list_store_set(liststore, &treeiter, 0, "f", -1);
    gtk_list_store_append(liststore, &treeiter);
    gtk_list_store_set(liststore, &treeiter, 0, "Aptosid", -1);
    gtk_list_store_append(liststore, &treeiter);
    gtk_list_store_set(liststore, &treeiter, 0, "OpenSuSE", -1);
    gtk_list_store_append(liststore, &treeiter);
    gtk_list_store_set(liststore, &treeiter, 0, "Linux Mint", -1);

    gtk_list_store_append(liststore, &treeiter);
    gtk_list_store_set(liststore, &treeiter, 0, "Arch Linux", -1);

    GtkWidget *treeview = gtk_tree_view_new_with_model(GTK_TREE_MODEL(liststore));

    GtkCellRenderer *cellrenderertext = gtk_cell_renderer_text_new();

    GtkTreeViewColumn *treeviewcolumn = gtk_tree_view_column_new_with_attributes("Distributions",
                                                                                 cellrenderertext,
                                                                                 "text", 0,
                                                                                 NULL);
    gtk_tree_view_append_column(GTK_TREE_VIEW(treeview), treeviewcolumn);

    return treeview;
}

int main(int argc, char *argv[])
{
  gtk_init(&argc, &argv);

  GtkWidget *window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
  gtk_window_set_default_size(GTK_WINDOW(window), 200, 200);
  g_signal_connect(window, "destroy", G_CALLBACK(destroy), NULL);

  GtkWidget *notebook = gtk_notebook_new();
  gtk_container_add(GTK_CONTAINER(window), notebook);


  int count;
  gchar *text;

  for (count = 1; count <= 5; count++)
    {
      text = g_strdup_printf("Page %d", count);
      GtkWidget *label = gtk_label_new(text);

      GtkWidget *vbox = gtk_box_new(GTK_ORIENTATION_VERTICAL, 5);
      GtkWidget *scrolledwindow = gtk_scrolled_window_new(NULL, NULL);

      GtkWidget *backbutton = gtk_button_new_with_label ("Back");
      gtk_widget_set_no_show_all (backbutton, TRUE);

      gtk_box_pack_start (GTK_BOX(vbox), scrolledwindow, TRUE, TRUE, 0);
      gtk_box_pack_end (GTK_BOX(vbox), backbutton, FALSE, FALSE, 0);


      GtkWidget* treeview = init_tree();
      GtkWidget* treeview2 = init_tree2();
      struct param* parameters = malloc(sizeof(struct param));
      parameters->backbutton = backbutton;
      parameters->scrolledwindow = scrolledwindow;
      parameters->oldChild= treeview;
      parameters->newChild= treeview2;

      g_signal_connect(treeview, "row-activated", G_CALLBACK(replace_tab), (gpointer) parameters);
      g_signal_connect(backbutton, "clicked", G_CALLBACK(Back), (gpointer) parameters);

      gtk_container_add(GTK_CONTAINER(scrolledwindow), treeview);
      gtk_notebook_append_page(GTK_NOTEBOOK(notebook), vbox, label);
    }

  gtk_widget_show_all(window);

  gtk_main();

  return 0;
}

我只想要图标背景而不是所有项目（图标+文字）..

Answer 1

使用delegate item并覆盖paint方法。

实施例

h file

class MyItemDelegate : public QItemDelegate
{
public:
   MyItemDelegate(QObject *parent = Q_NULLPTR);
   void paint ( QPainter * painter, const QStyleOptionViewItem & oStyleOption, const QModelIndex & index ) const;

}

CPP

void MyItemDelegate::paint(QPainter *painter, const QStyleOptionViewItem &oStyleOption, const QModelIndex &index) const
{
    // Apply for column 0
    if (index.column() == 0) {  

       // background color
       Qt::GlobalColor eColor;

       // Get table data
       if (index.model()->data(index).toString() == "INL")
           eColor = Qt::green;
       else
           eColor = Qt::yellow;

       painter->save();

       // background rect size (icon size 16x16 + padding)
       QRect oRect(oStyleOption.rect.x() + 2, oStyleOption.rect.y() + 6 , 16, 16);

       // background color
       painter->fillRect(oRect, eColor);
       painter->restore();    
   }
   return QItemDelegate::paint(painter,oStyleOption,index);
}

使用setItemDelegateForColumn

将项目设置为您的表格

Qtreewidget项目在Qtreewidgetitem中将颜色更改为Icon

1 个答案: