使用按钮助记符不会更新第二个旋转按钮值

Using button mnemonic doesn't update second spinbutton value

我制作了一个示例 Gtk::Spinbutton 对话框程序,用户可以在其中修改 Width/Height 值并查看主 Gtk::Window

上输出的更改(文本)

我添加了两个按钮; 取消确定,助记符开启set_use_underline()

出于测试目的,我假设用户正在修改这两个值。当我使用鼠标单击“确定”按钮时,程序运行良好。两个值都已更新。但是,当使用确定按钮助记符 (Alt + O) 接受更改时,高度或宽度值无法正确更新。例如,在宽度字段中我输入 1366,在高度字段中输入 768,然后我点击 Alt + O 以激活确定按钮操作,更新宽度但不更新高度。相反,保留先前的高度值,在程序开始时为 1.

核心class

#ifndef WIDTHHEIGHT_H
#define WIDTHHEIGHT_H

class WidthHeight
{
    int width, height;

public:
    void set_width_core(int width = 1);
    int  get_width_core();
    void set_height_core(int height = 1);
    int  get_height_core();
};

#endif // WIDTHHEIGHT_H

#include "widthheight.h"

void WidthHeight::set_width_core(int width)
{
    this->width = width;
}

int WidthHeight::get_width_core()
{
    return width;
}

void WidthHeight::set_height_core(int height)
{
    this->height = height;
}

int WidthHeight::get_height_core()
{
    return height;
}

对话框class

#ifndef WIDTHHEIGHTDIALOG_H
#define WIDTHHEIGHTDIALOG_H

#include <gtkmm/adjustment.h>
#include <gtkmm/dialog.h>
#include <gtkmm/label.h>
#include <gtkmm/spinbutton.h>

class WidthHeight;
class ExampleWindow;

class WidthHeightDialog : public Gtk::Dialog
{
    WidthHeight &core;
    ExampleWindow &window;
    Gtk::Label width, height;
    Glib::RefPtr<Gtk::Adjustment> w_adjustment, h_adjustment;
    Gtk::SpinButton *w_entry, *h_entry;

    enum response_id {
        REJECT,
        ACCEPT
    };

    void on_action_signal_response(int);

public:
    WidthHeightDialog(WidthHeight &, ExampleWindow &);
};

#endif // WIDTHHEIGHTDIALOG_H

#include <iostream>

#include "widthheightdialog.h"
#include "widthheight.h"
#include "examplewindow.h"

void WidthHeightDialog::on_action_signal_response(int id)
{
    switch (id)
    {
    case Gtk::RESPONSE_CLOSE:
    case response_id::REJECT:
        std::cout << "Canceled\n";
        break;
    case response_id::ACCEPT:
        std::cout << "OKayed\n";
        break;
    }

    core.set_width_core(w_entry->get_value_as_int());
    core.set_height_core(h_entry->get_value_as_int());
    window.refresh_label();
    std::cout << "Width: " << w_entry->get_value_as_int() << std::endl;
    std::cout << "Height: " << h_entry->get_value_as_int() << std::endl;

    hide();
}

WidthHeightDialog::WidthHeightDialog(WidthHeight &core, ExampleWindow &window)
    : Dialog("Change Width/Height value")
    , core(core)
    , window(window)
    , width("Width:")
    , height("Height:")
    , w_adjustment(Gtk::Adjustment::create(1, 1, 100000))
    , h_adjustment(Gtk::Adjustment::create(1, 1, 100000))
    , w_entry(manage(new Gtk::SpinButton(w_adjustment, 1, 0)))
    , h_entry(manage(new Gtk::SpinButton(h_adjustment, 1, 0)))
{
    auto box = get_content_area();
    box->add(width);
    box->add(*w_entry);
    box->add(height);
    box->add(*h_entry);

    box->show_all();

    add_button("_Cancel", response_id::REJECT)->set_use_underline();
    add_button("_OK"    , response_id::ACCEPT)->set_use_underline();

    signal_response().connect(sigc::mem_fun(*this, &WidthHeightDialog::on_action_signal_response));
}

Window class

#ifndef EXAMPLEWINDOW_H
#define EXAMPLEWINDOW_H

#include <gtkmm/box.h>
#include <gtkmm/button.h>
#include <gtkmm/label.h>
#include <gtkmm/window.h>

#include "widthheight.h"
#include "widthheightdialog.h"

class ExampleWindow : public Gtk::Window
{
    Gtk::Box vbox;
    Gtk::Label label;
    Gtk::Button button;
    WidthHeight core;
    WidthHeightDialog dialog;

    void on_button_clicked();

public:
    ExampleWindow();
    void refresh_label();
};

#endif // EXAMPLEWINDOW_H

#include "examplewindow.h"

void ExampleWindow::on_button_clicked()
{
    dialog.show();

    dialog.present();
}

ExampleWindow::ExampleWindow()
    : vbox(Gtk::ORIENTATION_VERTICAL)
    , label("\n\tOutput printed on console...\t\n")
    , button("Change Width/Height value")
    , dialog(core, *this)
{
    set_title("Example");

    add(vbox);

    core.set_width_core();
    core.set_height_core();
    refresh_label();

    vbox.pack_start(label);
    label.set_line_wrap(true);
    label.set_selectable(true);

    vbox.pack_start(button);
    button.signal_clicked().connect(sigc::mem_fun(*this, &ExampleWindow::on_button_clicked));

    dialog.set_transient_for(*this);

    show_all_children();

    button.grab_focus();
}

void ExampleWindow::refresh_label()
{
    std::string width = "\n Width: " + std::to_string(core.get_width_core()) + "\n";
    std::string height = "Height: " + std::to_string(core.get_height_core()) + "\n";

    label.set_text(width + height);
}

主要

#include <gtkmm/application.h>

#include "examplewindow.h"

int main()
{
    auto app = Gtk::Application::create("org.gtkmm.example");

    ExampleWindow window;

    return app->run(window);
}

旋转框似乎有更新问题。例如,尝试以下操作:

  1. 启动应用程序。
  2. 修改宽度,然后修改高度。
  3. 在宽度编辑框内单击。
  4. 命中Alt+O

在这种情况下,您会看到两个值都已更新(就像单击时一样)。我相信当你点击时,同样的事情会发生,但按钮。单击它相当于第 3 步(即将焦点放在另一个小部件上),这似乎会自动更新旋转框。

要解决此问题,您可以使用 Gtk::SpinButton::update() 方法强制更新旋转框。在您的情况下,您将拥有:

void WidthHeightDialog::on_action_signal_response(int id)
{
    switch (id)
    {
    case Gtk::RESPONSE_CLOSE:
    case response_id::REJECT:
        std::cout << "Canceled\n";
        break;
    case response_id::ACCEPT:
        std::cout << "OKayed\n";
        break;
    }

    w_entry->update();  // Forces an update
    h_entry->update();  // Forces an update

    core.set_width_core(w_entry->get_value_as_int());
    core.set_height_core(h_entry->get_value_as_int());
    window.refresh_label();
    std::cout << "Width: " << w_entry->get_value_as_int() << std::endl;
    std::cout << "Height: " << h_entry->get_value_as_int() << std::endl;

    hide();
}

这将确保对于两个旋转框,即使用户没有将焦点放在另一个小部件上(并因此触发对最后修改的旋转框的自动更新),更新仍然发生。