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Merge branch 'win-transparency'

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Improve shaped sample and its documentation.

See #22230.
This commit is contained in:
Vadim Zeitlin
2022-03-28 00:16:31 +01:00
parent 6d6e5cde21 80a056a58b
commit 70e119140c
4 changed files with 102 additions and 39 deletions
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122
samples/shaped/shaped.cpp
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@@ -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());
}