c - 以编程方式将数据添加到 Glade 3.12.1 中创建的 GtkTreeView/GtkListStore

Question

我一直在自学如何用 C 编写代码并利用 GTK 在 Linux 中编写应用程序，在实现之前使用 Glade 设计 UI。我一直在尝试利用 GtkTreeView 和 GtkListStore 来显示数据，但我似乎遇到了问题。我可以让我的应用程序正常启动并正确显示窗口和对话框，但我无法弄清楚如何以编程方式将数据行添加到列表存储并让它们出现在树视图中；我发现的大多数教程似乎更喜欢在 Glade 中制作行，或者通过代码设计整个界面。使用代码原样运行程序时，我没有收到任何错误，但我看不到在 GtkTreeView 中添加任何内容。我也没有看到任何空白行被添加。

通过编写一些代码强制生成错误，我可以看到postingButton正在连接的信号（我认为）所以应该没问题。我只是在 GtkTreeView 的实际实现中遗漏了一些东西。如果有人可以帮助我，我将不胜感激！

编辑：存在的 GtkEntries 将在稍后实施；我只是想让数据显示出来。

C代码：

/* I'd give objects better names normally, no worries!
 * Just goofing around for now.*/

#include <gtk-3.0/gtk/gtk.h> // Needed for interface.
#include <gtk-3.0/gdk/gdk.h>
#include <glib-2.0/glib-object.h>

void on_mainWindow_destroy(GObject *object, gpointer user_data)
{
    gtk_main_quit();
}

void on_stupidButton_clicked(GtkButton *button, gpointer *user_data)
{
    gtk_dialog_run(GTK_DIALOG(user_data));
}

void on_postingButton_clicked(GtkButton *button, gpointer *user_data)
{
    GtkListStore *liststore1;
    GtkWidget *treeview1; // I've tried defining this as a GtkTreeView as well.
    GtkTreeIter iter;
    GtkBuilder *listStoreBuilder;

    listStoreBuilder = gtk_builder_new();
    gtk_builder_add_from_file(listStoreBuilder,
            "../testing_interface.glade", 0);

    treeview1 = GTK_WIDGET(gtk_builder_get_object(listStoreBuilder,
            "treeview1")); // I'd change this to GTK_TREE_VIEW if the
                           // above is a GtkTreeView.
    liststore1 = GTK_LIST_STORE(
            gtk_tree_view_get_model((GtkTreeView *)treeview1));

    gtk_list_store_append(liststore1, &iter);
    gtk_list_store_set(liststore1, &iter, 0, "c", 1, "d", -1);

    gtk_builder_connect_signals(listStoreBuilder, 0);

    g_object_unref(G_OBJECT(listStoreBuilder));
    g_object_unref(G_OBJECT(liststore1));
}

void on_cancelButton_clicked(GtkButton *button, gpointer *user_data)
{
    gtk_widget_destroy((GtkWidget *)user_data);
}

int main(int argc, char *argv[])
{
    GtkBuilder *builder;
    GtkWidget *mainWindow, *dumbDialog;
    GtkButton *stupidButton;

    gtk_init(&argc, &argv);

    builder = gtk_builder_new();
    gtk_builder_add_from_file(builder, "../testing_interface.glade",
            0);

    mainWindow = GTK_WIDGET(gtk_builder_get_object(builder, "mainWindow"));
    stupidButton = GTK_BUTTON(gtk_builder_get_object(builder, "stupidButton"));
    dumbDialog = GTK_WIDGET(gtk_builder_get_object(builder, "dumbDialog"));

    gtk_builder_connect_signals(builder, 0);

    g_object_unref(G_OBJECT(builder));
    gtk_widget_show(mainWindow);
    gtk_main();

    return 0;
}

林间空地文件（testing_interface.glade）：

<?xml version="1.0" encoding="UTF-8"?>
<interface>
  <!-- interface-requires gtk+ 3.0 -->
  <object class="GtkDialog" id="dumbDialog">
    <property name="can_focus">False</property>
    <property name="border_width">5</property>
    <property name="type_hint">dialog</property>
    <child internal-child="vbox">
      <object class="GtkBox" id="dialog-vbox1">
        <property name="can_focus">False</property>
        <property name="orientation">vertical</property>
        <property name="spacing">2</property>
        <child internal-child="action_area">
          <object class="GtkButtonBox" id="dialog-action_area1">
            <property name="can_focus">False</property>
            <property name="layout_style">end</property>
            <child>
              <object class="GtkButton" id="postingButton">
                <property name="label" translatable="yes">Post</property>
                <property name="use_action_appearance">False</property>
                <property name="visible">True</property>
                <property name="can_focus">True</property>
                <property name="receives_default">True</property>
                <property name="use_action_appearance">False</property>
                <signal name="clicked" handler="on_postingButton_clicked" swapped="no"/>
              </object>
              <packing>
                <property name="expand">False</property>
                <property name="fill">True</property>
                <property name="position">0</property>
              </packing>
            </child>
            <child>
              <object class="GtkButton" id="cancelButton">
                <property name="label" translatable="yes">Cancel</property>
                <property name="use_action_appearance">False</property>
                <property name="visible">True</property>
                <property name="can_focus">True</property>
                <property name="receives_default">True</property>
                <property name="use_action_appearance">False</property>
                <signal name="clicked" handler="on_cancelButton_clicked" object="dumbDialog" swapped="no"/>
              </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="pack_type">end</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="orientation">vertical</property>
            <child>
              <object class="GtkEntry" id="entry1">
                <property name="visible">True</property>
                <property name="can_focus">True</property>
                <property name="invisible_char">●&lt;/property>
              </object>
              <packing>
                <property name="expand">False</property>
                <property name="fill">True</property>
                <property name="position">0</property>
              </packing>
            </child>
            <child>
              <object class="GtkEntry" id="entry2">
                <property name="visible">True</property>
                <property name="can_focus">True</property>
                <property name="invisible_char">●&lt;/property>
              </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>
      </object>
    </child>
    <action-widgets>
      <action-widget response="0">postingButton</action-widget>
      <action-widget response="0">cancelButton</action-widget>
    </action-widgets>
  </object>
  <object class="GtkListStore" id="liststore1">
    <columns>
      <!-- column-name Testing -->
      <column type="gchararray"/>
      <!-- column-name Testing1 -->
      <column type="gchararray"/>
    </columns>
  </object>
  <object class="GtkWindow" id="mainWindow">
    <property name="can_focus">False</property>
    <signal name="destroy" handler="on_mainWindow_destroy" swapped="no"/>
    <child>
      <object class="GtkBox" id="box1">
        <property name="visible">True</property>
        <property name="can_focus">False</property>
        <property name="orientation">vertical</property>
        <child>
          <object class="GtkTreeView" id="treeview1">
            <property name="height_request">183</property>
            <property name="visible">True</property>
            <property name="can_focus">True</property>
            <property name="model">liststore1</property>
            <child internal-child="selection">
              <object class="GtkTreeSelection" id="treeview-selection1"/>
            </child>
            <child>
              <object class="GtkTreeViewColumn" id="testing1Col">
                <property name="title" translatable="yes">column</property>
                <child>
                  <object class="GtkCellRendererText" id="cellrenderertext1"/>
                  <attributes>
                    <attribute name="text">0</attribute>
                  </attributes>
                </child>
              </object>
            </child>
            <child>
              <object class="GtkTreeViewColumn" id="testing2Col">
                <property name="title" translatable="yes">column</property>
                <child>
                  <object class="GtkCellRendererText" id="cellrenderertext2"/>
                  <attributes>
                    <attribute name="text">1</attribute>
                  </attributes>
                </child>
              </object>
            </child>
          </object>
          <packing>
            <property name="expand">False</property>
            <property name="fill">True</property>
            <property name="position">0</property>
          </packing>
        </child>
        <child>
          <object class="GtkButton" id="stupidButton">
            <property name="label" translatable="yes">button</property>
            <property name="use_action_appearance">False</property>
            <property name="visible">True</property>
            <property name="can_focus">True</property>
            <property name="receives_default">True</property>
            <property name="use_action_appearance">False</property>
            <signal name="clicked" handler="on_stupidButton_clicked" object="dumbDialog" swapped="no"/>
          </object>
          <packing>
            <property name="expand">False</property>
            <property name="fill">True</property>
            <property name="position">1</property>
          </packing>
        </child>
      </object>
    </child>
  </object>
</interface>

score 2 · Accepted Answer

您将行附加到树视图的代码基本上没问题，但有几个问题阻止它工作。

您正在为每个条目创建和填充一个新的构建器on_postingButton_clicked。这显然是不正确的，因为这意味着您在每次单击 Post 按钮时都会创建一个新树和一个新商店。这很容易通过发送回调treeview1来user_data解决。on_postingButton_clicked你已经这样做了dialog，所以我只是<signal name="clicked" handler="on_postingButton_clicked" ...>在你的 XML 中修改为也包含object="treeview1"。
你对g_object_unref. gtk_tree_view_get_model不会增加其模型的引用计数，因此您不应取消引用您获得的列表存储。main如果你想传递它并从中检索对象（无论如何它是一个单例），取消构建器可能是一个坏主意。
你应该#include <gtk/gtk.h>没有介入gtk-3.0目录。如果您的编译失败，那么您可能没有pkg-flags正确设置。

这是适用于我的代码的修改版本。它需要如上所述修改 XML。

/* compile with:
   gcc -O2 -Wall glade-test.c $(pkg-config gtk+-3.0 gmodule-export-2.0 --cflags --libs) */

#include <gtk/gtk.h>
#include <gdk/gdk.h>
#include <glib-object.h>

void on_mainWindow_destroy(GObject *object, gpointer user_data)
{
    gtk_main_quit();
}

void on_stupidButton_clicked(GtkButton *button, gpointer *user_data)
{
    gtk_dialog_run(GTK_DIALOG(user_data));
}

void on_postingButton_clicked(GtkButton *button, gpointer *user_data)
{
    GtkTreeIter iter;
    GtkTreeView *treeview1 = GTK_TREE_VIEW(user_data);
    GtkListStore *liststore1 = GTK_LIST_STORE(gtk_tree_view_get_model(treeview1));

    gtk_list_store_append(liststore1, &iter);
    gtk_list_store_set(liststore1, &iter, 0, "c", 1, "d", -1);
}

void on_cancelButton_clicked(GtkButton *button, gpointer *user_data)
{
    gtk_widget_destroy((GtkWidget *)user_data);
}

int main(int argc, char *argv[])
{
    GtkBuilder *builder;

    gtk_init(&argc, &argv);

    builder = gtk_builder_new();
    gtk_builder_add_from_file(builder, "testing_interface.glade", 0);
    gtk_builder_connect_signals(builder, 0);
    gtk_widget_show(GTK_WIDGET(gtk_builder_get_object(builder, "mainWindow")));
    g_object_unref(G_OBJECT(builder));
    gtk_main();

    return 0;
}

c - 以编程方式将数据添加到 Glade 3.12.1 中创建的 GtkTreeView/GtkListStore

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