在 gtkmm 中捕捉鼠标运动

问题描述 投票：0回答：2

当我按住鼠标中键时，我试图捕捉鼠标运动。目标是在 stl 查看器中实现旋转功能。

我找到了事件掩码

BUTTON2_MOTION_MASK
。但我很难弄清楚哪个信号捕获了它。

这是我用来创建和挂钩事件的两行。这两行位于 GtkApplicationWindow 构造函数内。

glWidget.add_events(Gdk::BUTTON2_MOTION_MASK);
glWidget.signal_motion_notify_event().connect(sigc::mem_fun(*this,&mainWindow::rotate));

这是我尝试连接的功能。 

bool mainWindow::rotate(GdkEventMotion* motion_event)
{
    cout<<"test"<<endl;
}

我使用的方法正确吗？当我按住鼠标中键并移动鼠标时，代码没有反应。

我设法让 glArea 小部件对这种滚动做出反应。 

glWidget.add_events(Gdk::SMOOTH_SCROLL_MASK);

glWidget.signal_scroll_event().connect(sigc::mem_fun(*this,&mainWindow::zoom));

我连接的功能：

bool mainWindow::zoom(GdkEventScroll *eventScroll)
{
        cout<<"test"<<endl;
        return true;
}
c++ user-interface c++11 gtk3 gtkmm3
2个回答
0
投票

我想通了。您需要添加 Gdk::Button1_MOTION_MASK 和 Gdk::BUTTON_PRESS_MASK。

glWidget.add_events(Gdk::Button1_MOTION_MASK | Gdk::BUTTON_PRESS_MASK);

当单击鼠标左键并将其放置在小部件上时，这将捕获信号。

BUTTON2_MOTION_MASK 需要按下 2 个按钮。由于某种原因，它只是鼠标左键（我想要中键）。

0
投票

我的 gtkmm4 试验示例就像这样工作，但我不是专家。此代码可以用鼠标事件替换“keyboard_event/simple”examplewindow.cc。

谢谢

#include "examplewindow.h"
#include <iostream>

ExampleWindow::ExampleWindow()
{
  set_title("Keyboard: Alt, Shift, Ctrl, Meta, Mouse move, Mouse click, Mouse scroll Events");
  m_container.set_margin(10);
  set_child(m_container);

  // Radio buttons:
  m_first.set_label("First (Alt+a)");
  m_second.set_label("Second (Alt+b)");

  m_second.set_group(m_first);
  m_first.set_active();

  // Main Container:
  m_container.set_orientation(Gtk::Orientation::HORIZONTAL);
  m_container.append(m_first);
  m_container.append(m_second);

  //add_events (GDK_SCROLL_SMOOTH );

  // Events.
  auto controller = Gtk::EventControllerKey::create();
  controller->signal_key_pressed().connect(
    sigc::mem_fun(*this, &ExampleWindow::on_window_key_pressed), false);
  add_controller(controller);


  auto controller1 = Gtk::EventControllerMotion::create();
  controller1->signal_motion().connect(
    sigc::mem_fun(*this, &ExampleWindow::on_Mouse_Motion), false);
  add_controller(controller1);

  auto controller2 = Gtk::EventControllerKey::create();
  controller2->signal_modifiers().connect(
    sigc::mem_fun(*this, &ExampleWindow::on_Modifiers), false);
  add_controller(controller2);

    auto controller3 = Gtk::EventControllerScroll::create();
    controller3->set_flags(Gtk::EventControllerScroll::Flags::VERTICAL);
      controller3->set_propagation_phase(Gtk::PropagationPhase::CAPTURE);
    controller3->signal_scroll().connect(
    sigc::mem_fun(*this, &ExampleWindow::on_scroll), false);
  add_controller(controller3);

  auto mouse = Gtk::GestureClick::create();
  mouse->set_propagation_phase(Gtk::PropagationPhase::CAPTURE);
  mouse->set_button(GDK_BUTTON_PRIMARY);
  mouse->signal_pressed().connect(sigc::mem_fun(*this, &ExampleWindow::on_mb1pressed), false);
  add_controller(mouse);

  auto mouse1 = Gtk::GestureClick::create();
  mouse1->set_propagation_phase(Gtk::PropagationPhase::CAPTURE);
  mouse1->set_button(GDK_BUTTON_PRIMARY);
  mouse1->signal_released().connect(sigc::mem_fun(*this, &ExampleWindow::on_mb1released), false);
  add_controller(mouse1);

    auto mouse2 = Gtk::GestureClick::create();
  mouse2->set_propagation_phase(Gtk::PropagationPhase::CAPTURE);
  mouse2->set_button(GDK_BUTTON_MIDDLE);
  mouse2->signal_pressed().connect(sigc::mem_fun(*this, &ExampleWindow::on_mb2pressed), false);
  add_controller(mouse2);

  auto mouse3 = Gtk::GestureClick::create();
  mouse3->set_propagation_phase(Gtk::PropagationPhase::CAPTURE);
  mouse3->set_button(GDK_BUTTON_MIDDLE);
  mouse3->signal_released().connect(sigc::mem_fun(*this, &ExampleWindow::on_mb2released), false);
  add_controller(mouse3);

    auto mouse4 = Gtk::GestureClick::create();
  mouse4->set_propagation_phase(Gtk::PropagationPhase::CAPTURE);
  mouse4->set_button(GDK_BUTTON_SECONDARY);
  mouse4->signal_pressed().connect(sigc::mem_fun(*this, &ExampleWindow::on_mb3pressed), false);
  add_controller(mouse4);

  auto mouse5 = Gtk::GestureClick::create();
  mouse5->set_propagation_phase(Gtk::PropagationPhase::CAPTURE);
  mouse5->set_button(GDK_BUTTON_SECONDARY);
  mouse5->signal_released().connect(sigc::mem_fun(*this, &ExampleWindow::on_mb3released), false);
  add_controller(mouse5);
}

bool ExampleWindow::on_scroll(double dx, double dy)
{
    std::cout << "on_scroll: "  << dx << ", "<< dy << std::endl;
return true;
 }

bool ExampleWindow::on_Modifiers(Gdk::ModifierType state)
{
  if ((state & Gdk::ModifierType::SHIFT_MASK)  == Gdk::ModifierType::SHIFT_MASK)
  {
    std::cout << "_SHIFT" << std::endl;
        return true;
  }
  if ((state & Gdk::ModifierType::CONTROL_MASK)  == Gdk::ModifierType::CONTROL_MASK)
  {
    std::cout << "_CTRL" << std::endl;
        return true;
  }
  if ((state & Gdk::ModifierType::ALT_MASK)  == Gdk::ModifierType::ALT_MASK)
  {
    std::cout << "_ALT" << std::endl;
        return true;
  }
  if ((state & Gdk::ModifierType::META_MASK)  == Gdk::ModifierType::META_MASK)
  {
    std::cout << "_META" << std::endl;
        return true;
  }

return false;
}

void ExampleWindow::on_mb1pressed(int n_press, double x, double y)
{
std::cout << "on_mb1Pressed: " << n_press << ", " << x << ", "<< y << std::endl;

}

void ExampleWindow::on_mb1released(int n_press, double x, double y)
{
std::cout << "on_mb1Released: " << n_press << ", " << x << ", "<< y << std::endl;
}

void ExampleWindow::on_mb2pressed(int n_press, double x, double y)
{
std::cout << "on_mb2Pressed: " << n_press << ", " << x << ", "<< y << std::endl;
}

void ExampleWindow::on_mb2released(int n_press, double x, double y)
{
std::cout << "on_mb2Released: " << n_press << ", " << x << ", "<< y << std::endl;
}

void ExampleWindow::on_mb3pressed(int n_press, double x, double y)
{
std::cout << "on_mb3Pressed: " << n_press << ", " << x << ", "<< y << std::endl;
}

void ExampleWindow::on_mb3released(int n_press, double x, double y)
{
std::cout << "on_mb3Released: " << n_press << ", " << x << ", "<< y << std::endl;
}


void ExampleWindow::on_Mouse_Motion(double x, double y)
{
std::cout << "on_Mouse_Motion: "  << x << ", "<< y << std::endl;
}

bool ExampleWindow::on_window_key_pressed(guint keyval, guint, Gdk::ModifierType state)
{
  //Gdk::ModifierType::ALT_MASK -> the 'Alt' key(mask)
  //GDK_KEY_1 -> the '1' key
  //GDK_KEY_2 -> the '2' key

  //select the first radio button, when we press alt + 1
  if((keyval == GDK_KEY_a) &&
    (state & (Gdk::ModifierType::SHIFT_MASK | Gdk::ModifierType::CONTROL_MASK | Gdk::ModifierType::ALT_MASK)) == Gdk::ModifierType::ALT_MASK)
  {
    m_first.set_active();
    //returning true, cancels the propagation of the event
    return true;
  }
  else if((keyval == GDK_KEY_b) &&
    (state & (Gdk::ModifierType::SHIFT_MASK | Gdk::ModifierType::CONTROL_MASK | Gdk::ModifierType::ALT_MASK)) == Gdk::ModifierType::ALT_MASK)
  {
    //and the second radio button, when we press alt + 2
    m_second.set_active();
    return true;
  }
  else if(keyval == GDK_KEY_Escape)
  {
    //close the window, when the 'esc' key is pressed
    set_visible(false);
    return true;
  }


  //the event has not been handled
  return false;
}

ExampleWindow::~ExampleWindow()
{
}
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