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Add comments for wxSTCListBoxD2D and its methods

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New Pagodi 2020-06-26 14:40:17 -05:00
parent 7f78e97021
commit 74332e9132
1 changed files with 13 additions and 0 deletions
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13
src/stc/PlatWX.cpp
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@ -3126,6 +3126,11 @@ void wxSTCListBox::OnDrawBackground(wxDC &dc, const wxRect &rect,size_t n) const
#ifdef HAVE_DIRECTWRITE_TECHNOLOGY
// This class will use SurfaceD2D methods to measure and draw items in the popup
// listbox. This is needed to ensure that the text in the listbox matches the
// text in the editor window as closely as possible.
class wxSTCListBoxD2D : public wxSTCListBox
{
public:
@ -3145,12 +3150,14 @@ public:
void SetListBoxFont(Font& font) wxOVERRIDE
{
// Retrieve the SurfaceFontDataD2D from font and store a copy of it.
wxFontWithAscent* fwa = wxFontWithAscent::FromFID(font.GetID());
SurfaceData* data = fwa->GetSurfaceFontData();
SurfaceFontDataD2D* d2dft = static_cast<SurfaceFontDataD2D*>(data);
m_surfaceFontData = new SurfaceFontDataD2D(*d2dft);
// Create a SurfaceD2D object to measure text height for the font.
SurfaceD2D surface;
wxClientDC dc(this);
surface.Init(&dc, GetGrandParent());
@ -3163,6 +3170,7 @@ public:
void OnDrawItemText(wxDC& dc, const wxRect& rect, const wxString& label,
const wxColour& textCol) const wxOVERRIDE
{
// Create a font and a surface object.
wxFontWithAscent* fontCopy = new wxFontWithAscent(wxFont());
SurfaceFontDataD2D* sfd = new SurfaceFontDataD2D(*m_surfaceFontData);
fontCopy->SetSurfaceFontData(sfd);
@ -3172,6 +3180,8 @@ public:
SurfaceD2D surface;
surface.Init(&dc, GetGrandParent());
// Ellipsize the label if necessary. This is done by manually removing
// characters from the end of the label until it's short enough.
wxString ellipsizedLabel = label;
wxCharBuffer buffer = wx2stc(ellipsizedLabel);
@ -3193,6 +3203,7 @@ public:
curWidth = surface.WidthText(tempFont, buffer.data(),ellipsizedLen);
}
// Construct the necessary Scintilla objects and then draw the label.
PRectangle prect = PRectangleFromwxRect(rect);
ColourDesired fore(textCol.Red(), textCol.Green(), textCol.Blue());
@ -3200,6 +3211,8 @@ public:
surface.DrawTextTransparent(prect, tempFont, ybase, buffer.data(),
ellipsizedLen, fore);
// Clean up.
tempFont.Release();
surface.Release();
}