how to detect input up and down on wxControl?

[Shadowblitz16]

is there a way to detect keyboard and mouse up and down events on wxControl?
I am trying to make a easier to use wrapper but I am having trouble understanding how to do this..

here is a example of what I am looking for...

Code: Select all

struct Control : private wxControl
{
	private:
		wxControl::OnMouseDown(wxMouseButton btn)
		{
			//Add Mouse Button
		}
		wxControl::OnMouseUp  (wxMouseButton btn)
		{
			//Remove Mouse Button
		}

		wxControl::OnKeyDown(wxKey btn)
		{
			//Add Keyboard Key
		}
		wxControl::OnKeyUp  (wxKey btn)
		{
			//Remove Keyboard Key
		}
		wxControl::OnEnter()
		{
			//Set Hovered to true;
		}
		wxControl::OnLeave()
		{
			//Set Hovered to false;
		}
};

then I could expose them to functions

[doublemax]

Catch the wxEVT_LEFT_UP/DOWN mouse events and wxEVT_KEY_UP/DOWN key events.

https://docs.wxwidgets.org/trunk/classw ... event.html
https://docs.wxwidgets.org/trunk/classwx_key_event.html

[ONEEYEMAN]

Hi,
Keep in mind that catching low-level events (such as mouse and keyboards) are usually not recommended in OSX. And some times you will have a funny behavior on OSX.

The usual way is to catch control-related messages (such as button click instad of mouse click on the button.

Thank you.

[Shadowblitz16]

@doublemax can you provide some example code on how to catch the events?
@ONEEYMAN isn't that what I am trying to do?

[doublemax]

@doublemax can you provide some example code on how to catch the events?

https://wiki.wxwidgets.org/Painting_your_custom_control

[Shadowblitz16]

wait is this necessary?

Code: Select all

BEGIN_EVENT_TABLE(wxCustomButton, wxPanel)

    EVT_MOTION(wxCustomButton::mouseMoved)
    EVT_LEFT_DOWN(wxCustomButton::mouseDown)
    EVT_LEFT_UP(wxCustomButton::mouseReleased)
    EVT_RIGHT_DOWN(wxCustomButton::rightClick)
    EVT_LEAVE_WINDOW(wxCustomButton::mouseLeftWindow)
    EVT_KEY_DOWN(wxCustomButton::keyPressed)
    EVT_KEY_UP(wxCustomButton::keyReleased)
    EVT_MOUSEWHEEL(wxCustomButton::mouseWheelMoved)

    // catch paint events
    EVT_PAINT(wxCustomButton::paintEvent)

END_EVENT_TABLE()

[ONEEYEMAN]

Hi,
No, but its an easiest solution.

Thank you.

[doublemax]

wait is this necessary?

You don't have to implement them all, just the ones you need.

[Shadowblitz16]

@doublemax i know its just a very odd way to do events.
it would be better if there was something like..

Code: Select all

MouseDown = myMouseDownFunction()

or

Code: Select all

MouseDown ->
{
	//my mouse down function
}

[PB]

You can use Bind() instead of event tables.

Bind() can use lambdas.

But you should probably start with learning wxWidgets basics. Check the official documentation and samples.

[PB]

Here is a complete compilable example of the most simplest implementation of a button-like control, implemented in more modern way than the one doublemax referenced above. It still does not use lambdas as I do not see their usefulness for this type of code here.

The control changes its appearance and mouse cursor shape when the left mouse button is pressed down on it, captures the mouse (so it is notified even about mouse events outside its client area), keeps the changed appearance and cursor until the left mouse button is released. It covers situations both where the mouse cursor is inside and outside the control when the mouse button is released. It also properly handles mouse capture being lost (taken over by another window).

If you understand the basics of wxWidgets or at least can use the online documentation, it should not be difficult to understand what is going there.

I would suggest running the code as is, so you can see what gets logged after different user-control interactions.

Code: Select all

#include <wx/wx.h>
#include <wx/dcbuffer.h>

class MyControl : public wxControl
{
public:
    MyControl(wxWindow* parent);
private:
    void OnPaint(wxPaintEvent& event);
    void OnMouseLeftDown(wxMouseEvent& event);
    void OnMouseLeftUp(wxMouseEvent& event);
    void OnMouseCaptureLost(wxMouseCaptureLostEvent& event);

    wxSize DoGetBestClientSize() const override;
};

MyControl::MyControl(wxWindow* parent)
    : wxControl(parent, wxID_ANY, wxDefaultPosition, wxDefaultSize, wxFULL_REPAINT_ON_RESIZE)
{
    SetBackgroundStyle(wxBG_STYLE_PAINT);

    Bind(wxEVT_PAINT, &MyControl::OnPaint, this);
    Bind(wxEVT_LEFT_DOWN, &MyControl::OnMouseLeftDown, this);
    Bind(wxEVT_LEFT_UP, &MyControl::OnMouseLeftUp, this);
    Bind(wxEVT_MOUSE_CAPTURE_LOST, &MyControl::OnMouseCaptureLost, this);
}

void MyControl::OnPaint(wxPaintEvent& WXUNUSED(event))
{
    wxAutoBufferedPaintDC dc(this);
    wxPen pen;
    wxBrush brush;

    if ( HasCapture() ) // draw in hot state
    {
        pen = *wxYELLOW_PEN;
        brush = *wxRED_BRUSH;

        wxLogMessage("Painting hot");
    }
    else
    {
        pen = *wxWHITE_PEN;
        brush = *wxBLUE_BRUSH;

        wxLogMessage("Painting default");
    }

    wxDCPenChanger penChanger(dc, pen);
    wxDCBrushChanger brushChanger(dc, brush);

    dc.DrawRectangle(GetClientRect());
}

void MyControl::OnMouseLeftDown(wxMouseEvent& event)
{
    event.Skip();

    CaptureMouse();
    SetCursor(wxCursor(wxCURSOR_HAND));

    wxLogMessage("Mouse left down");

    Refresh(); // force redraw in "hot" state
    Update();
}

void MyControl::OnMouseLeftUp(wxMouseEvent& event)
{
    event.Skip();

    if ( !HasCapture() )
    {
        wxLogMessage("Mouse left up but either capture was lost or mouse down was outside the control");
        return;
    }

    ReleaseMouse();

    if ( GetClientRect().Contains(event.GetPosition()) )
        wxLogMessage("Mouse left up inside the control");
    else
        wxLogMessage("Mouse left up outside the control");

    SetCursor(wxCursor(wxCURSOR_DEFAULT));

    Refresh(); // force redraw
    Update();
}

void MyControl::OnMouseCaptureLost(wxMouseCaptureLostEvent& event)
{
    event.Skip();

    SetCursor(wxCursor(wxCURSOR_DEFAULT));
    Refresh(); // force redraw in "default" state
    Update();

    wxLogMessage("Mouse capture lost");
}

wxSize MyControl::DoGetBestClientSize() const
{
    return wxSize(FromDIP(wxSize(200, 100)));
}

class MyApp : public wxApp
{
public:
    bool OnInit()
    {
        wxFrame* frame = new wxFrame(nullptr, wxID_ANY, "Test", wxDefaultPosition, wxSize(500, 500));
        wxBoxSizer* sizer = new wxBoxSizer(wxVERTICAL);

        MyControl* control = new MyControl(frame);
        sizer->Add(control, wxSizerFlags().TripleBorder().CenterHorizontal());

        wxTextCtrl* logCtrl = new wxTextCtrl(frame, wxID_ANY, wxEmptyString, wxDefaultPosition, wxDefaultSize,
            wxTE_MULTILINE | wxTE_READONLY | wxTE_RICH2);
        wxLog::SetActiveTarget(new wxLogTextCtrl(logCtrl));
        wxLog::DisableTimestamp();
        sizer->Add(logCtrl, wxSizerFlags().Proportion(1).Expand().Border());

        frame->SetSizer(sizer);
        frame->Show();

        return true;
    }
}; wxIMPLEMENT_APP(MyApp);

[ONEEYEMAN]

Hi, PB,
Out of curiosity - did you try that code on *nix/OSX?

Thank you.

[PB]

ONEEYEMAN, I have not. I use only MSW.

It's just a basic wxWidgets code, with no platform specific stuff. Do you see a problem there?