c - GTKScrolled Window 中的 GTK3 C 程序按钮，带有 GTKTreeView 和 GTKListStore，可将行滚动到 View 中

Question

我用 C 语言将一个程序移植到 GTK3，除了一件事之外，一切都很完美。假设 TreeView 一次只显示 10 行，但填充了 100 行，其他行当然不在 View 中， TreeView 设置为单选多列行。

我使用按钮回调函数突出显示并选择第 0 行，然后在调用结束时增加静态索引++。按下“下一步”按钮会突出显示并选择第 1 行，依此类推。

当突出显示和选定的行到达第 11 行(不在 View 中)时，我不知道如何滚动 TreeView 以便下一个第 11 行进入 View 。这些行不断突出显示，因为我有 printf 语句用于反馈。我用谷歌搜索了几个星期，看到了例子和所有的东西，但对C来说不是那么多，虽然我必须将一些其他代码翻译成C，我用来弄清楚如何选择和突出显示行，但在C中无法弄清楚滚动部分。

使用 Glade，我有一个带有子 GtkFixed 的主窗口，带有按钮、进度栏，GtkFixed 中是一个 GtkScrolledWindow，其中包含一个 GtkViewPort，其中包含基于字符串的列的 GtkTreeView。

感谢您的任何反馈和/或链接。不确定 TreeView 是否需要位于 GtkViewPort 内，但可能在开发和研究过程中查看了旧代码。

我的回调函数

void single_button_clicked_cb(GtkWidget *widget, gpointer data)
{
    static int         index = 0;
    GtkTreeIter iter;
    char buf[9];
    GtkTreeModel *model;
    GtkAdjustment *vadjustment;
    int i;

    printf("\nScroll Active test row to %d\n",index);

    sprintf(buf,"%d",index);

    gtk_widget_grab_focus (GTK_WIDGET(gtk_tree_view));

    GtkTreePath *path = gtk_tree_path_new_from_string(buf);

    gtk_tree_view_scroll_to_cell(GTK_TREE_VIEW (gtk_tree_view),path, NULL,FALSE, 0.0, 0.0);

    gtk_tree_view_set_cursor (gtk_tree_view,path,NULL,FALSE); // works but doesn't scroll

    gtk_tree_path_free(path);

    index++;
}

林地文件

<?xml version="1.0" encoding="UTF-8"?>
<interface>
  <!-- interface-requires gtk+ 3.0 -->
  <!-- interface-naming-policy toplevel-contextual -->
  <object class="GtkAdjustment" id="adjustment1">
    <property name="upper">100</property>
    <property name="step_increment">1</property>
    <property name="page_increment">10</property>
  </object>
  <object class="GtkListStore" id="gtk_list_store">
    <columns>
      <!-- column-name Test -->
      <column type="gchararray"/>
      <!-- column-name Test1 -->
      <column type="gchararray"/>
      <!-- column-name Test2 -->
      <column type="gchararray"/>
      <!-- column-name Test3 -->
      <column type="gchararray"/>
      <!-- column-name Test4 -->
      <column type="gchararray"/>
      <!-- column-name Pass -->
      <column type="gchararray"/>
    </columns>
  </object>
  <object class="GtkWindow" id="main_window">
    <property name="width_request">1050</property>
    <property name="height_request">810</property>
    <property name="can_focus">False</property>
    <property name="border_width">3</property>
    <property name="resizable">False</property>
    <property name="window_position">center</property>
    <property name="gravity">center</property>
    <signal name="destroy" handler="on_main_window_destroy" swapped="no"/>
    <child>
      <object class="GtkFixed" id="gtk_fixed">
        <property name="visible">True</property>
        <property name="can_focus">False</property>
        <child>
          <object class="GtkButton" id="start_button">
            <property name="label" translatable="yes">Start</property>
            <property name="width_request">100</property>
            <property name="height_request">48</property>
            <property name="visible">True</property>
            <property name="can_focus">True</property>
            <property name="receives_default">True</property>
            <signal name="clicked" handler="start_button_clicked_cb" swapped="no"/>
          </object>
          <packing>
            <property name="x">935</property>
            <property name="y">605</property>
          </packing>
        </child>
        <child>
          <object class="GtkButton" id="single_button">
            <property name="label" translatable="yes">Single</property>
            <property name="width_request">100</property>
            <property name="height_request">48</property>
            <property name="visible">True</property>
            <property name="can_focus">True</property>
            <property name="receives_default">True</property>
            <signal name="clicked" handler="single_button_clicked_cb" swapped="no"/>
          </object>
          <packing>
            <property name="x">6</property>
            <property name="y">605</property>
          </packing>
        </child>
        <child>
          <object class="GtkProgressBar" id="progress_bar">
            <property name="width_request">1030</property>
            <property name="height_request">25</property>
            <property name="visible">True</property>
            <property name="can_focus">False</property>
          </object>
          <packing>
            <property name="x">1</property>
            <property name="y">100</property>
          </packing>
        </child>
        <child>
          <object class="GtkScrolledWindow" id="scrolled_window">
            <property name="width_request">1030</property>
            <property name="height_request">465</property>
            <property name="visible">True</property>
            <property name="can_focus">True</property>
            <property name="vadjustment">adjustment1</property>
            <property name="hscrollbar_policy">never</property>
            <property name="vscrollbar_policy">automatic</property>
            <child>
              <object class="GtkViewport" id="gtk_viewport">
                <property name="visible">True</property>
                <property name="can_focus">False</property>
                <child>
                  <object class="GtkTreeView" id="gtk_tree_view">
                    <property name="visible">True</property>
                    <property name="can_focus">True</property>
                    <property name="model">gtk_list_store</property>
                    <property name="headers_clickable">False</property>
                    <property name="enable_grid_lines">both</property>
                    <signal name="cursor-changed" handler="selected_row_index_cb" swapped="no"/>
                    <child>
                      <object class="GtkTreeViewColumn" id="col_test_description">
                        <property name="resizable">True</property>
                        <property name="title" translatable="yes">Test Description</property>
                        <child>
                          <object class="GtkCellRendererText" id="col_renderer_description"/>
                        </child>
                      </object>
                    </child>
                    <child>
                      <object class="GtkTreeViewColumn" id="col_test_number">
                        <property name="resizable">True</property>
                        <property name="title" translatable="yes">Test Number</property>
                        <property name="alignment">0.5</property>
                        <child>
                          <object class="GtkCellRendererText" id="col_renderer_number"/>
                        </child>
                      </object>
                    </child>
                    <child>
                      <object class="GtkTreeViewColumn" id="col_test_limits">
                        <property name="resizable">True</property>
                        <property name="title" translatable="yes">Test Limits</property>
                        <property name="alignment">0.5</property>
                        <child>
                          <object class="GtkCellRendererText" id="col_renderer_limits"/>
                        </child>
                      </object>
                    </child>
                    <child>
                      <object class="GtkTreeViewColumn" id="col_test_measurement">
                        <property name="resizable">True</property>
                        <property name="title" translatable="yes">Test Measurement</property>
                        <property name="alignment">0.5</property>
                        <child>
                          <object class="GtkCellRendererText" id="col_renderer_measurement"/>
                        </child>
                      </object>
                    </child>
                    <child>
                      <object class="GtkTreeViewColumn" id="col_test_units">
                        <property name="resizable">True</property>
                        <property name="title" translatable="yes">Test Units</property>
                        <child>
                          <object class="GtkCellRendererText" id="col_renderer_units"/>
                        </child>
                      </object>
                    </child>
                    <child>
                      <object class="GtkTreeViewColumn" id="col_test_pass_fail">
                        <property name="resizable">True</property>
                        <property name="title" translatable="yes">Pass / Fail</property>
                        <property name="alignment">0.5</property>
                        <child>
                          <object class="GtkCellRendererText" id="col_renderer_pass_fail"/>
                        </child>
                      </object>
                    </child>
                  </object>
                </child>
              </object>
            </child>
          </object>
          <packing>
            <property name="x">3</property>
            <property name="y">132</property>
          </packing>
        </child>
        <child>
          <object class="GtkMenuBar" id="menu">
            <property name="width_request">180</property>
            <property name="height_request">30</property>
            <property name="visible">True</property>
            <property name="can_focus">False</property>
            <child>
              <object class="GtkMenuItem" id="gtk_file_menu_item">
                <property name="visible">True</property>
                <property name="can_focus">False</property>
                <property name="label" translatable="yes">_File</property>
                <property name="use_underline">True</property>
                <child type="submenu">
                  <object class="GtkMenu" id="gtk_file_menu">
                    <property name="visible">True</property>
                    <property name="can_focus">False</property>
                    <child>
                      <object class="GtkImageMenuItem" id="gtk_new">
                        <property name="label">gtk-new</property>
                        <property name="visible">True</property>
                        <property name="can_focus">False</property>
                        <property name="use_underline">True</property>
                        <property name="use_stock">True</property>
                      </object>
                    </child>
                    <child>
                      <object class="GtkImageMenuItem" id="gtk_open">
                        <property name="label">gtk-open</property>
                        <property name="visible">True</property>
                        <property name="can_focus">False</property>
                        <property name="use_underline">True</property>
                        <property name="use_stock">True</property>
                        <signal name="activate" handler="open_limits_file" swapped="no"/>
                      </object>
                    </child>
                    <child>
                      <object class="GtkImageMenuItem" id="gtk_save">
                        <property name="label">gtk-save</property>
                        <property name="visible">True</property>
                        <property name="can_focus">False</property>
                        <property name="use_underline">True</property>
                        <property name="use_stock">True</property>
                      </object>
                    </child>
                    <child>
                      <object class="GtkImageMenuItem" id="gtk_save_as">
                        <property name="label">gtk-save-as</property>
                        <property name="visible">True</property>
                        <property name="can_focus">False</property>
                        <property name="use_underline">True</property>
                        <property name="use_stock">True</property>
                      </object>
                    </child>
                    <child>
                      <object class="GtkSeparatorMenuItem" id="separatormenuitem1">
                        <property name="visible">True</property>
                        <property name="can_focus">False</property>
                      </object>
                    </child>
                    <child>
                      <object class="GtkImageMenuItem" id="gtk_quit">
                        <property name="label">gtk-quit</property>
                        <property name="visible">True</property>
                        <property name="can_focus">False</property>
                        <property name="use_underline">True</property>
                        <property name="use_stock">True</property>
                        <signal name="activate" handler="on_main_window_destroy" swapped="no"/>
                      </object>
                    </child>
                  </object>
                </child>
              </object>
            </child>
            <child>
              <object class="GtkMenuItem" id="gtk_edit_menu_item">
                <property name="visible">True</property>
                <property name="can_focus">False</property>
                <property name="label" translatable="yes">_Edit</property>
                <property name="use_underline">True</property>
                <child type="submenu">
                  <object class="GtkMenu" id="gtk_edit_menu">
                    <property name="visible">True</property>
                    <property name="can_focus">False</property>
                    <child>
                      <object class="GtkImageMenuItem" id="imagemenuitem6">
                        <property name="label">gtk-cut</property>
                        <property name="visible">True</property>
                        <property name="can_focus">False</property>
                        <property name="use_underline">True</property>
                        <property name="use_stock">True</property>
                      </object>
                    </child>
                    <child>
                      <object class="GtkImageMenuItem" id="imagemenuitem7">
                        <property name="label">gtk-copy</property>
                        <property name="visible">True</property>
                        <property name="can_focus">False</property>
                        <property name="use_underline">True</property>
                        <property name="use_stock">True</property>
                      </object>
                    </child>
                    <child>
                      <object class="GtkImageMenuItem" id="imagemenuitem8">
                        <property name="label">gtk-paste</property>
                        <property name="visible">True</property>
                        <property name="can_focus">False</property>
                        <property name="use_underline">True</property>
                        <property name="use_stock">True</property>
                      </object>
                    </child>
                    <child>
                      <object class="GtkImageMenuItem" id="imagemenuitem9">
                        <property name="label">gtk-delete</property>
                        <property name="visible">True</property>
                        <property name="can_focus">False</property>
                        <property name="use_underline">True</property>
                        <property name="use_stock">True</property>
                      </object>
                    </child>
                  </object>
                </child>
              </object>
            </child>
            <child>
              <object class="GtkMenuItem" id="gtk_view_menu_item">
                <property name="visible">True</property>
                <property name="can_focus">False</property>
                <property name="label" translatable="yes">_View</property>
                <property name="use_underline">True</property>
              </object>
            </child>
            <child>
              <object class="GtkMenuItem" id="gtk_help_menu_item">
                <property name="visible">True</property>
                <property name="can_focus">False</property>
                <property name="label" translatable="yes">_Help</property>
                <property name="use_underline">True</property>
                <child type="submenu">
                  <object class="GtkMenu" id="gtk_help_menu">
                    <property name="visible">True</property>
                    <property name="can_focus">False</property>
                    <child>
                      <object class="GtkImageMenuItem" id="imagemenuitem10">
                        <property name="label">gtk-about</property>
                        <property name="visible">True</property>
                        <property name="can_focus">False</property>
                        <property name="use_underline">True</property>
                        <property name="use_stock">True</property>
                      </object>
                    </child>
                  </object>
                </child>
              </object>
            </child>
          </object>
          <packing>
            <property name="x">-1</property>
            <property name="y">-1</property>
          </packing>
        </child>
        <child>
          <object class="GtkLabel" id="test_name">
            <property name="width_request">1030</property>
            <property name="height_request">80</property>
            <property name="visible">True</property>
            <property name="can_focus">False</property>
            <property name="use_markup">True</property>
            <property name="justify">center</property>
            <property name="single_line_mode">True</property>
          </object>
          <packing>
            <property name="x">3</property>
            <property name="y">667</property>
          </packing>
        </child>
        <child>
          <object class="GtkLabel" id="test_command">
            <property name="width_request">1030</property>
            <property name="height_request">80</property>
            <property name="visible">True</property>
            <property name="can_focus">False</property>
            <property name="use_markup">True</property>
            <property name="justify">center</property>
            <property name="single_line_mode">True</property>
          </object>
          <packing>
            <property name="x">3</property>
            <property name="y">32</property>
          </packing>
        </child>
      </object>
    </child>
  </object>
</interface>

Answer 1

终于找到问题了。我发现的另一个例子将 TreeView 作为视口(viewport)的 subview 。也许来自 GTK 的早期版本。

来自文档 Gnome Developer Documentation for GtkScrolledWindow

滚动窗口有两种工作方式。一些小部件具有 native 滚动支持；这些小部件实现了 GtkScrollable 接口(interface)。具有 native 滚动支持的小部件包括 GtkTreeView、GtkTextView 和 GtkLayout。

对于缺乏 native 滚动支持的小部件，GtkViewport 小部件充当适配器类，为缺乏自己的滚动功能的子小部件实现可滚动性。使用 GtkViewport 滚动子部件，例如 GtkGrid、GtkBox 等。