Finish implementation of "use system colors" checkbox.

ColorCache: 
  * method isSystem() allows to know whether a color can be overridden by system colors
  * method get() has a variant that accepts a bool (system color or not)
  * code simplifications
GuiPrefs:
  * hide colors set from the system when they are inherited
  * syncronize list of colors and checkbox


git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@35101 a592a061-630c-0410-9148-cb99ea01b6c8

src/frontends/qt4/ColorCache.cpp

@@ -17,65 +17,79 @@
 
 namespace lyx {
 
-void ColorCache::setColor(int col, QPalette::ColorRole cr)
+namespace{
+// FIXME (later): Qt >= 4.4 has a proper QPalette::NoRole value.
+QPalette::ColorRole const NoRole = static_cast<QPalette::ColorRole>(-1);
+
+QPalette::ColorRole role(ColorCode col)
 {
-	lcolors_[col] = pal_.brush(QPalette::Active, cr).color();
+	switch (ColorCode(col)) {
+	case Color_background:
+	case Color_commentbg:
+	case Color_greyedoutbg:
+	case Color_mathbg:
+	case Color_graphicsbg:
+	case Color_mathmacrobg:
+	case Color_mathcorners:
+		return QPalette::Base;
+		break;
+				
+	case Color_foreground:
+	case Color_cursor:
+	case Color_preview:
+	case Color_tabularline:
+	case Color_previewframe:
+		return QPalette::Text;
+		break;
+				
+	case Color_selection:
+		return QPalette::Highlight;
+		break;
+	case Color_selectiontext:
+		return QPalette::HighlightedText;
+		break;
+	default:
+		return NoRole;
+	}
+}
+
 }
 
 
 void ColorCache::init()
 {
-	if (lyxrc.use_system_colors) {
-		for (int col = 0; col <= Color_ignore; ++col) {
-			switch (ColorCode(col)) {
-			case Color_background:
-			case Color_commentbg:
-			case Color_greyedoutbg:
-			case Color_mathbg:
-			case Color_graphicsbg:
-			case Color_mathmacrobg:
-			case Color_mathcorners:
-				setColor(col, QPalette::Base);
-				break;
-				
-			case Color_foreground:
-			case Color_cursor:
-			case Color_preview:
-			case Color_tabularline:
-			case Color_previewframe:
-				setColor(col, QPalette::Text);
-				break;
-				
-			case Color_selection:
-				setColor(col, QPalette::Highlight);
-				break;
-			case Color_selectiontext:
-				setColor(col, QPalette::HighlightedText);
-				break;
-			default:
-				lcolors_[col] = QColor(lcolor.getX11Name(ColorCode(col)).c_str());
-			}
-		}
-	} else {
-		for (int col = 0; col <= Color_ignore; ++col) 
-			lcolors_[col] = QColor(lcolor.getX11Name(ColorCode(col)).c_str());
+	for (int col = 0; col <= Color_ignore; ++col) {
+		lcolors_[col] = QColor(lcolor.getX11Name(ColorCode(col)).c_str());
 	}
+
 	initialized_ = true;
 }
 
 
 /// get the given color
-QColor ColorCache::get(Color color) const
+QColor ColorCache::get(Color const & color) const
+{
+	return get(color, lyxrc.use_system_colors);
+}
+
+
+/// get the given color
+QColor ColorCache::get(Color const & color, bool syscolors) const
 {
 	if (!initialized_)
 		const_cast<ColorCache *>(this)->init();
-	if (color <= Color_ignore && color.mergeColor == Color_ignore)
-		return lcolors_[color.baseColor];
+	if (color <= Color_ignore && color.mergeColor == Color_ignore) {
+		QPalette::ColorRole cr = role(color.baseColor);
+		if (syscolors && cr != NoRole) 
+			return pal_.brush(QPalette::Active, cr).color();
+		else
+			return lcolors_[color.baseColor];
+	}
 	if (color.mergeColor != Color_ignore) {
 		// FIXME: This would ideally be done in the Color class, but
 		// that means that we'd have to use the Qt code in the core.
-		QColor base_color = get(color.baseColor).toRgb();
-		QColor merge_color = get(color.mergeColor).toRgb();
+		QColor base_color = get(color.baseColor, syscolors).toRgb();
+		QColor merge_color = get(color.mergeColor, syscolors).toRgb();
 		return QColor(
 			(base_color.red() + merge_color.red()) / 2,
 			(base_color.green() + merge_color.green()) / 2,
@@ -86,6 +100,12 @@ QColor ColorCache::get(Color color) const
 }
 
 
+bool ColorCache::isSystem(ColorCode const color) const
+{
+	return role(color) != NoRole;
+}
+
+
 QColor const rgb2qcolor(RGBColor const & rgb)
 {
 	return QColor(rgb.r, rgb.g, rgb.b);

src/frontends/qt4/ColorCache.h

@@ -30,11 +30,17 @@ public:
 	///
 	ColorCache() : initialized_(false) {}
 
+	/// get the given color (depends on LyXRC::use_system_color)
+	QColor get(Color const & color) const;
+
 	/// get the given color
-	QColor get(Color color) const;
+	QColor get(Color const & color, bool use_system_colors) const;
+
+	/// is this color replaced when LyXRC::use_system_color is true?
+	bool isSystem(ColorCode color) const;
 
 	/// change the undelying palette
-	void setPalette(QPalette const pal) { pal_ = pal; initialized_ = false; }
+	void setPalette(QPalette const pal) { pal_ = pal; clear(); }
 
 	/// clear all colors
 	void clear() { initialized_ = false; }
@@ -43,8 +49,6 @@ private:
 	///
 	void init();
 	///
-	void setColor(int col, QPalette::ColorRole cr);
-	///
 	QColor lcolors_[Color_ignore + 1];
 	///
 	bool initialized_;

src/frontends/qt4/GuiPrefs.cpp

@@ -1090,6 +1090,8 @@ PrefColors::PrefColors(GuiPreferences * form)
 		this, SLOT(changeColor()));
 	connect(syscolorsCB, SIGNAL(toggled(bool)),
 		this, SIGNAL(changed()));
+	connect(syscolorsCB, SIGNAL(toggled(bool)),
+		this, SLOT(changeSysColor()));
 }
 
 
@@ -1110,7 +1112,7 @@ void PrefColors::apply(LyXRC & rc) const
 void PrefColors::update(LyXRC const & rc)
 {
 	for (unsigned int i = 0; i < lcolors_.size(); ++i) {
-		QColor color = QColor(guiApp->colorCache().get(lcolors_[i]));
+		QColor color = QColor(guiApp->colorCache().get(lcolors_[i], false));
 		QPixmap coloritem(32, 32);
 		coloritem.fill(color);
 		lyxObjectsLW->item(i)->setIcon(QIcon(coloritem));
@@ -1142,6 +1144,18 @@ void PrefColors::changeColor()
 	}
 }
 
+void PrefColors::changeSysColor()
+{
+	for (int row = 0 ; row < lyxObjectsLW->count() ; ++row) {
+		// skip colors that are taken from system palette
+		bool const hide = syscolorsCB->isChecked()
+			&& guiApp->colorCache().isSystem(lcolors_[row]);
+
+		lyxObjectsLW->item(row)->setHidden(hide);
+	}
+
+}
+
 void PrefColors::changeLyxObjectsSelection()
 {
 	colorChangePB->setDisabled(lyxObjectsLW->currentRow() < 0);

src/frontends/qt4/GuiPrefs.h

@@ -254,6 +254,7 @@ public:
 
 private Q_SLOTS:
 	void changeColor();
+	void changeSysColor();
 	void changeLyxObjectsSelection();
 
 private: