writing dynamic text on wxSplashWindow possible? Topic is solved

[evstevemd]

Hi,
Is it possible to write to splash screen mesaages of what currently app is doing. something like adobe apps and many others does?

loading file xyz....
loading plugins...
loading blahbla

[Auria]

Not sure that the factory one allows doing that, but it should be easy to create your own splashscreen

[evstevemd]

Not sure that the factory one allows doing that, but it should be easy to create your own splashscreen

Hi Auria,
almost happy easter
I need pointers to even possibilities. I'm using custom splash screen and I wonder if there is any way I could write text on bitmap.

[Auria]

Writing text on a wxBitmap is easily done by creating a wxMemoryDC on that bitmap

[evstevemd]

Writing text on a wxBitmap is easily done by creating a wxMemoryDC on that bitmap

Last question for now. Can that text be erase/overwritten
Sorry for late reply...holidays holidays

[Auria]

Writing text on a wxBitmap is easily done by creating a wxMemoryDC on that bitmap

Last question for now. Can that text be erase/overwritten
Sorry for late reply...holidays holidays

just load the original bitmap again and the text will be gone...

[evstevemd]

Writing text on a wxBitmap is easily done by creating a wxMemoryDC on that bitmap

Last question for now. Can that text be erase/overwritten
Sorry for late reply...holidays holidays

just load the original bitmap again and the text will be gone...

I have tried that but it does not work! Here is a code I do use:

Code: Select all

HSplashScreen::HSplashScreen(wxWindow* parent, wxBitmap& bitmap):wxSplashScreen(bitmap, wxSPLASH_CENTRE_ON_SCREEN|wxSPLASH_TIMEOUT, 6000, NULL, -1, wxDefaultPosition, wxDefaultSize, wxBORDER_SIMPLE|wxSTAY_ON_TOP) {
	 m_frame = parent;
	 m_bitmap = bitmap;
}

HSplashScreen::~HSplashScreen() {
	m_frame->Show(true);
}

void HSplashScreen::WriteMessage(wxString& message){
	 // Create a memory DC
     wxMemoryDC theDC;
     theDC.SelectObject(m_bitmap);
	 wxPoint pt = wxDefaultPosition;
	 theDC.DrawText(message, pt); 
}

[Auria]

I don't see anywhere in your code that you are trying to remove the text.

Try something like...

Code: Select all

HSplashScreen::HSplashScreen(wxWindow* parent, wxBitmap& bitmap):wxSplashScreen(bitmap, wxSPLASH_CENTRE_ON_SCREEN|wxSPLASH_TIMEOUT, 6000, NULL, -1, wxDefaultPosition, wxDefaultSize, wxBORDER_SIMPLE|wxSTAY_ON_TOP) {
    m_frame = parent;
    m_original_bitmap = bitmap;
    m_bitmap = bitmap.GetSubBitmap(wxRect(0, 0, m_original_bitmap.GetWidth(), m_original_bitmap.GetHeight()));
}

HSplashScreen::~HSplashScreen() {
   m_frame->Show(true);
}

void HSplashScreen::WriteMessage(wxString& message){
    // Create a memory DC
    m_bitmap = m_original_bitmap.GetSubBitmap(wxRect(0, 0, m_original_bitmap.GetWidth(), m_original_bitmap.GetHeight()));
     wxMemoryDC theDC;
     theDC.SelectObject(m_bitmap);
    wxPoint pt = wxDefaultPosition;
    theDC.DrawText(message, pt);
}

Notice the 'GetSubBitmap' trick that comes from the docs. Normally wx uses reference-counted COW for bitmaps, so you need GetSubBitmap to get a real copy

[evstevemd]

I don't see anywhere in your code that you are trying to remove the text.

Try something like...

Code: Select all

HSplashScreen::HSplashScreen(wxWindow* parent, wxBitmap& bitmap):wxSplashScreen(bitmap, wxSPLASH_CENTRE_ON_SCREEN|wxSPLASH_TIMEOUT, 6000, NULL, -1, wxDefaultPosition, wxDefaultSize, wxBORDER_SIMPLE|wxSTAY_ON_TOP) {
    m_frame = parent;
    m_original_bitmap = bitmap;
    m_bitmap = bitmap.GetSubBitmap(wxRect(0, 0, m_original_bitmap.GetWidth(), m_original_bitmap.GetHeight()));
}

HSplashScreen::~HSplashScreen() {
   m_frame->Show(true);
}

void HSplashScreen::WriteMessage(wxString& message){
    // Create a memory DC
    m_bitmap = m_original_bitmap.GetSubBitmap(wxRect(0, 0, m_original_bitmap.GetWidth(), m_original_bitmap.GetHeight()));
     wxMemoryDC theDC;
     theDC.SelectObject(m_bitmap);
    wxPoint pt = wxDefaultPosition;
    theDC.DrawText(message, pt);
}

Notice the 'GetSubBitmap' trick that comes from the docs. Normally wx uses reference-counted COW for bitmaps, so you need GetSubBitmap to get a real copy

Nothing works, in fact even text is not written. I suspect the points from wxDefaultPosition (-1,-1) is out of bitmap.
Is there a way to get coordinates that are within wxSplashScreen image?

[PB]

I am probably overlooking something here but I don't see you setting the updated bitmap (with text) to the window actually doing the splash screen paitning and asking it to redraw itself? :S

I tried the simplest implementation possible, it seems to work properly (on Windows XP)

Code: Select all

#include <wx/wxprec.h>

#ifndef WX_PRECOMP
    // Include your minimal set of headers here, or wx.h
#include <wx/wx.h>
#endif

#include <wx/stdpaths.h>
#include <wx/filename.h>
#include <wx/splash.h>

class TextSplashScreen : public wxSplashScreen
{
public:
    TextSplashScreen(const wxBitmap& bitmap, long splashStyle, int milliseconds, wxWindow* parent)
        : wxSplashScreen (bitmap,  splashStyle, milliseconds, parent, wxID_ANY)
    {        
        wxASSERT(bitmap.IsOk());

        m_noTextBitmap = bitmap;
    }

    void SetText(const wxString& text)
    {                
        wxBitmap bitmap(m_noTextBitmap);        
        
        if (!text.empty()) {
            wxMemoryDC memDC;
            
            memDC.SelectObject(bitmap);
            
            memDC.SetBackgroundMode(wxTRANSPARENT);
            memDC.SetTextForeground(*wxRED);        
            memDC.DrawText(text, 0, 0);
            
            memDC.SelectObject(wxNullBitmap);
        }
        m_window->SetBitmap(bitmap);
        m_window->Refresh();
        m_window->Update();
    }
private:
    wxBitmap m_noTextBitmap;
};

class MyFrame : public wxFrame
{
public:
    MyFrame()
        : wxFrame(NULL, wxID_ANY, _("Test"))
    {        
        
        wxBitmap bitmap(wxFileName(wxStandardPaths::Get().GetDataDir(), "horse.bmp").GetFullPath(), wxBITMAP_TYPE_BMP);
        if (bitmap.IsOk()) {
            TextSplashScreen* splash = new TextSplashScreen(bitmap, wxSPLASH_CENTRE_ON_SCREEN | wxSPLASH_TIMEOUT,
                6000, NULL);

            splash->SetText(wxT("Loading configuration..."));
            wxMilliSleep(1500);
            splash->SetText(wxT("Loading textures..."));
            wxMilliSleep(1500);
            splash->SetText(wxT("Doing whatever..."));            
        }
    }	
};

/**** MyApp ****/
class MyApp : public wxApp
{
public:	
	virtual bool OnInit()
	{
		if (!wxApp::OnInit())
			return false;       	

        wxInitAllImageHandlers();        

        MyFrame* frame = new MyFrame();
        frame ->Show();

        return true;
	}
};

IMPLEMENT_APP(MyApp)

[evstevemd]

I am probably overlooking something here but I don't see you setting the updated bitmap (with text) to the window actually doing the splash screen paitning and asking it to redraw itself? :S

I tried the simplest implementation possible, it seems to work properly (on Windows XP)

Code: Select all

#include <wx/wxprec.h>

#ifndef WX_PRECOMP
    // Include your minimal set of headers here, or wx.h
#include <wx/wx.h>
#endif

#include <wx/stdpaths.h>
#include <wx/filename.h>
#include <wx/splash.h>

class TextSplashScreen : public wxSplashScreen
{
public:
    TextSplashScreen(const wxBitmap& bitmap, long splashStyle, int milliseconds, wxWindow* parent)
        : wxSplashScreen (bitmap,  splashStyle, milliseconds, parent, wxID_ANY)
    {        
        wxASSERT(bitmap.IsOk());

        m_noTextBitmap = bitmap;
    }

    void SetText(const wxString& text)
    {                
        wxBitmap bitmap(m_noTextBitmap);        
        
        if (!text.empty()) {
            wxMemoryDC memDC;
            
            memDC.SelectObject(bitmap);
            
            memDC.SetBackgroundMode(wxTRANSPARENT);
            memDC.SetTextForeground(*wxRED);        
            memDC.DrawText(text, 0, 0);
            
            memDC.SelectObject(wxNullBitmap);
        }
        m_window->SetBitmap(bitmap);
        m_window->Refresh();
        m_window->Update();
    }
private:
    wxBitmap m_noTextBitmap;
};

class MyFrame : public wxFrame
{
public:
    MyFrame()
        : wxFrame(NULL, wxID_ANY, _("Test"))
    {        
        
        wxBitmap bitmap(wxFileName(wxStandardPaths::Get().GetDataDir(), "horse.bmp").GetFullPath(), wxBITMAP_TYPE_BMP);
        if (bitmap.IsOk()) {
            TextSplashScreen* splash = new TextSplashScreen(bitmap, wxSPLASH_CENTRE_ON_SCREEN | wxSPLASH_TIMEOUT,
                6000, NULL);

            splash->SetText(wxT("Loading configuration..."));
            wxMilliSleep(1500);
            splash->SetText(wxT("Loading textures..."));
            wxMilliSleep(1500);
            splash->SetText(wxT("Doing whatever..."));            
        }
    }	
};

/**** MyApp ****/
class MyApp : public wxApp
{
public:	
	virtual bool OnInit()
	{
		if (!wxApp::OnInit())
			return false;       	

        wxInitAllImageHandlers();        

        MyFrame* frame = new MyFrame();
        frame ->Show();

        return true;
	}
};

IMPLEMENT_APP(MyApp)

Thanks PB, that works fine.

[Buzz]

Hi,

Three years later, I'd like to continue on this thread.

The code sample provided by PB works fine on Windows and Linux, but on OSX, the text is not updated at each call to SetText().
It looks like the bitmap and text are only updated when I leave the wxFrame's constructor.

Did anybody succeed to make it work on OSX ? or am I missing something somewhere ?

I'm running wxCOCOA 3.0.0 on OSX 10.10.1

Thanks for any clue.
Buzz.

[evstevemd]

I will post stripped code of what I use in my app ... once at home!

[Buzz]

Cool ! Thanks !