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Support using GetTextExtent() with empty string to get descent in wxOSX.

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Allow measuring the descent and external leading of an empty string by
measuring just a space instead in wxOSX. This makes the behaviour more
consistent with wxMSW and makes the unit test added in r74464 pass under OS X
too.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74524 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Vadim Zeitlin
2013-07-15 01:31:56 +00:00
parent 166988aa35
commit 14619f10b0
1 changed files with 32 additions and 16 deletions
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36
src/osx/carbon/graphics.cpp
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@@ -2512,15 +2512,19 @@ void wxMacCoreGraphicsContext::GetTextExtent( const wxString &str, wxDouble *wid
if ( externalLeading )
*externalLeading = 0;
// In wxWidgets (MSW-inspired) API it is possible to call GetTextExtent()
// with an empty string to get just the descent and the leading of the
// font, so support this (mis)use.
wxString strToMeasure(str);
if (str.empty())
return;
strToMeasure = wxS(" ");
#if wxOSX_USE_CORE_TEXT
{
wxMacCoreGraphicsFontData* fref = (wxMacCoreGraphicsFontData*)m_font.GetRefData();
CTFontRef font = fref->OSXGetCTFont();
wxCFStringRef text(str, wxLocale::GetSystemEncoding() );
wxCFStringRef text(strToMeasure, wxLocale::GetSystemEncoding() );
CFStringRef keys[] = { kCTFontAttributeName };
CFTypeRef values[] = { font };
wxCFRef<CFDictionaryRef> attributes( CFDictionaryCreate(kCFAllocatorDefault, (const void**) &keys, (const void**) &values,
@@ -2531,14 +2535,18 @@ void wxMacCoreGraphicsContext::GetTextExtent( const wxString &str, wxDouble *wid
CGFloat a, d, l, w;
w = CTLineGetTypographicBounds(line, &a, &d, &l);
if ( !str.empty() )
{
if ( width )
*width = w;
if ( height )
*height = a+d+l;
}
if ( descent )
*descent = d;
if ( externalLeading )
*externalLeading = l;
if ( width )
*width = w;
return;
}
#endif
@@ -2547,7 +2555,7 @@ void wxMacCoreGraphicsContext::GetTextExtent( const wxString &str, wxDouble *wid
OSStatus status = noErr;
ATSUTextLayout atsuLayout;
wxMacUniCharBuffer unibuf( str );
wxMacUniCharBuffer unibuf( strToMeasure );
UniCharCount chars = unibuf.GetChars();
ATSUStyle style = (((wxMacCoreGraphicsFontData*)m_font.GetRefData())->GetATSUStyle());
@@ -2565,14 +2573,18 @@ void wxMacCoreGraphicsContext::GetTextExtent( const wxString &str, wxDouble *wid
status = ::ATSUGetUnjustifiedBounds( atsuLayout, kATSUFromTextBeginning, kATSUToTextEnd,
&textBefore , &textAfter, &textAscent , &textDescent );
if ( !str.empty() )
{
if ( width )
*width = FixedToFloat(textAfter - textBefore);
if ( height )
*height = FixedToFloat(textAscent + textDescent);
}
if ( descent )
*descent = FixedToFloat(textDescent);
if ( externalLeading )
*externalLeading = 0;
if ( width )
*width = FixedToFloat(textAfter - textBefore);
::ATSUDisposeTextLayout(atsuLayout);
@@ -2582,19 +2594,23 @@ void wxMacCoreGraphicsContext::GetTextExtent( const wxString &str, wxDouble *wid
#if wxOSX_USE_IPHONE
wxMacCoreGraphicsFontData* fref = (wxMacCoreGraphicsFontData*)m_font.GetRefData();
wxCFStringRef text(str, wxLocale::GetSystemEncoding() );
wxCFStringRef text(strToMeasure, wxLocale::GetSystemEncoding() );
CGSize sz = MeasureTextInContext( fref->GetUIFont() , text.AsNSString() );
if ( !str.empty() )
{
if ( width )
*width = sz.width;
if ( height )
*height = sz.height;
}
/*
if ( descent )
*descent = FixedToFloat(textDescent);
if ( externalLeading )
*externalLeading = 0;
*/
if ( width )
*width = sz.width;
#endif
CheckInvariants();