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Make transparency window in the shaped sample work under MSW

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Still show transparent window even if IsTransparentBackgroundSupported()
returns false, just don't make their background transparent and only use
SetTransparent() in this case. In fact, don't try to use transparent
background style at all by default and add a separate menu item to do it
if wanted.

Also add a slider to allow changing opacity of the window.

Finally, make the window big enough in high DPI under MSW by using
FromDIP().
This commit is contained in:
Vadim Zeitlin
2022-03-25 01:39:39 +01:00
parent 58800c09e4
commit 279af795ed
1 changed files with 86 additions and 36 deletions
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122
samples/shaped/shaped.cpp
View File

@@ -36,6 +36,9 @@
#include "wx/dcclient.h"
#include "wx/graphics.h"
#include "wx/image.h"
#include "wx/scopedptr.h"
#include "wx/sizer.h"
#include "wx/slider.h"
#ifndef wxHAS_IMAGES_IN_RESOURCES
#include "../sample.xpm"
@@ -50,6 +53,7 @@ enum
{
Show_Shaped = 100,
Show_Transparent,
Show_TransparentBg,
// must be consecutive and in the same order as wxShowEffect enum elements
Show_Effect_First,
@@ -134,12 +138,14 @@ private:
class SeeThroughFrame : public wxFrame
{
public:
void Create();
void Create(wxWindow* parent);
private:
// event handlers (these functions should _not_ be virtual)
void OnPaint(wxPaintEvent& evt);
void OnAlpha(wxCommandEvent& event);
// any class wishing to process wxWidgets events must use this macro
wxDECLARE_EVENT_TABLE();
};
@@ -238,6 +244,7 @@ bool MyApp::OnInit()
wxBEGIN_EVENT_TABLE(MainFrame, wxFrame)
EVT_MENU(Show_Shaped, MainFrame::OnShowShaped)
EVT_MENU(Show_Transparent, MainFrame::OnShowTransparent)
EVT_MENU(Show_TransparentBg, MainFrame::OnShowTransparent)
EVT_MENU_RANGE(Show_Effect_First, Show_Effect_Last, MainFrame::OnShowEffect)
EVT_MENU(wxID_EXIT, MainFrame::OnExit)
wxEND_EVENT_TABLE()
@@ -252,6 +259,8 @@ MainFrame::MainFrame()
wxMenu * const menuFrames = new wxMenu;
menuFrames->Append(Show_Shaped, "Show &shaped window\tCtrl-S");
menuFrames->Append(Show_Transparent, "Show &transparent window\tCtrl-T");
menuFrames->Append(Show_TransparentBg,
"Show with &transparent background\tShift-Ctrl-T");
menuFrames->AppendSeparator();
menuFrames->Append(Show_Effect_Roll, "Show &rolled effect\tCtrl-R");
menuFrames->Append(Show_Effect_Slide, "Show s&lide effect\tCtrl-L");
@@ -272,19 +281,27 @@ void MainFrame::OnShowShaped(wxCommandEvent& WXUNUSED(event))
shapedFrame->Show(true);
}
void MainFrame::OnShowTransparent(wxCommandEvent& WXUNUSED(event))
void MainFrame::OnShowTransparent(wxCommandEvent& event)
{
wxString reason;
if (IsTransparentBackgroundSupported(&reason))
SeeThroughFrame *seeThroughFrame = new SeeThroughFrame;
if ( event.GetId() == Show_TransparentBg )
{
SeeThroughFrame *seeThroughFrame = new SeeThroughFrame;
seeThroughFrame->Create();
seeThroughFrame->Show(true);
}
else
{
wxLogError("%s, can't create transparent window.", reason);
wxString reason;
if (IsTransparentBackgroundSupported(&reason))
{
seeThroughFrame->SetBackgroundStyle(wxBG_STYLE_TRANSPARENT);
}
else
{
wxLogError("Can't use transparent background: %s", reason);
delete seeThroughFrame;
return;
}
}
seeThroughFrame->Create(this);
seeThroughFrame->Show(true);
}
void MainFrame::OnShowEffect(wxCommandEvent& event)
@@ -474,44 +491,77 @@ wxBEGIN_EVENT_TABLE(SeeThroughFrame, wxFrame)
EVT_PAINT(SeeThroughFrame::OnPaint)
wxEND_EVENT_TABLE()
void SeeThroughFrame::Create()
void
SeeThroughFrame::Create(wxWindow* parent)
{
SetBackgroundStyle(wxBG_STYLE_TRANSPARENT);
wxFrame::Create(NULL, wxID_ANY, "Transparency test",
wxPoint(100, 30), wxSize(300, 300),
wxFrame::Create(parent, wxID_ANY, "Transparency test",
wxDefaultPosition, wxWindow::FromDIP(wxSize(300, 300), parent),
wxDEFAULT_FRAME_STYLE |
wxFULL_REPAINT_ON_RESIZE |
wxSTAY_ON_TOP);
SetBackgroundColour(*wxWHITE);
const int initialAlpha = wxALPHA_OPAQUE / 2;
// Create control for choosing alpha and put it in the middle of the window.
wxPanel* panel = new wxPanel(this);
wxSlider* slider = new wxSlider
(
panel,
wxID_ANY,
initialAlpha,
wxALPHA_TRANSPARENT,
wxALPHA_OPAQUE,
wxDefaultPosition,
FromDIP(wxSize(256, -1)),
wxSL_HORIZONTAL | wxSL_LABELS
);
slider->Bind(wxEVT_SLIDER, &SeeThroughFrame::OnAlpha, this);
const wxSizerFlags center = wxSizerFlags().Center().Border();
wxSizer* sizer = new wxBoxSizer(wxVERTICAL);
sizer->Add(new wxStaticText(panel, wxID_ANY, "Window opacity:"), center);
sizer->Add(slider, center);
panel->SetSizer(sizer);
wxSizer* sizerTop = new wxBoxSizer(wxVERTICAL);
sizerTop->AddStretchSpacer();
sizerTop->Add(panel, center);
sizerTop->AddStretchSpacer();
SetSizer(sizerTop);
// Note that this must be called before the frame is shown.
SetTransparent(initialAlpha);
}
// Paints a grid of varying hue and alpha
void SeeThroughFrame::OnPaint(wxPaintEvent& WXUNUSED(evt))
{
wxPaintDC dc(this);
dc.SetPen(wxNullPen);
wxScopedPtr<wxGraphicsContext> gc(wxGraphicsContext::Create(dc));
int xcount = 8;
int ycount = 8;
// Draw 3 bands: one opaque, one semi-transparent and one transparent.
const wxSize size = GetClientSize();
const double h = size.y / 3.0;
double xstep = 1.0 / xcount;
double ystep = 1.0 / ycount;
wxGraphicsPath path = gc->CreatePath();
path.AddRectangle(0, 0, size.x, h);
gc->SetBrush(wxBrush(wxColour(0, 0, 255, wxALPHA_OPAQUE)));
gc->FillPath(path);
int width = GetClientSize().GetWidth();
int height = GetClientSize().GetHeight();
gc->SetBrush(wxBrush(wxColour(0, 0, 255, wxALPHA_OPAQUE / 2)));
gc->Translate(0, h);
gc->FillPath(path);
for ( double x = 0; x < 1; x += xstep )
{
for ( double y = 0; y < 1; y += ystep )
{
wxImage::RGBValue v = wxImage::HSVtoRGB(wxImage::HSVValue(x, 1., 1.));
dc.SetBrush(wxBrush(wxColour(v.red, v.green, v.blue,
(int)(255*(1. - y)))));
int x1 = (int)(x * width);
int y1 = (int)(y * height);
int x2 = (int)((x + xstep) * width);
int y2 = (int)((y + ystep) * height);
dc.DrawRectangle(x1, y1, x2 - x1, y2 - y1);
}
}
// This blue won't actually be seen and instead the white background will
// be visible, because this brush is fully transparent.
gc->SetBrush(wxBrush(wxColour(0, 0, 255, wxALPHA_TRANSPARENT)));
gc->Translate(0, h);
gc->FillPath(path);
}
void SeeThroughFrame::OnAlpha(wxCommandEvent& event)
{
SetTransparent(event.GetInt());
}