Allow to restore default UI colors in prefs

Patch by Daniel Ramöller (racoon), with slight modifications of mine.

Fixes: #10062

src/frontends/qt4/GuiPrefs.cpp

@@ -1149,6 +1149,10 @@ PrefColors::PrefColors(GuiPreferences * form)
 
 	connect(colorChangePB, SIGNAL(clicked()),
 		this, SLOT(changeColor()));
+	connect(colorResetPB, SIGNAL(clicked()),
+		this, SLOT(resetColor()));
+	connect(colorResetAllPB, SIGNAL(clicked()),
+		this, SLOT(resetAllColor()));
 	connect(lyxObjectsLW, SIGNAL(itemSelectionChanged()),
 		this, SLOT(changeLyxObjectsSelection()));
 	connect(lyxObjectsLW, SIGNAL(itemActivated(QListWidgetItem*)),
@@ -1176,15 +1180,17 @@ void PrefColors::applyRC(LyXRC & rc) const
 
 void PrefColors::updateRC(LyXRC const & rc)
 {
-	for (unsigned int i = 0; i < lcolors_.size(); ++i) {
+	for (size_type i = 0; i < lcolors_.size(); ++i) {
 		QColor color = QColor(guiApp->colorCache().get(lcolors_[i], false));
 		QPixmap coloritem(32, 32);
 		coloritem.fill(color);
-		lyxObjectsLW->item(i)->setIcon(QIcon(coloritem));
+		lyxObjectsLW->item(int(i))->setIcon(QIcon(coloritem));
 		newcolors_[i] = curcolors_[i] = color.name();
 	}
 	syscolorsCB->setChecked(rc.use_system_colors);
 	changeLyxObjectsSelection();
+
+	setDisabledResets();
 }
 
 
@@ -1196,25 +1202,115 @@ void PrefColors::changeColor()
 	if (row < 0)
 		return;
 
-	QString const color = newcolors_[row];
+	QString const color = newcolors_[size_t(row)];
-	QColor c = QColorDialog::getColor(QColor(color), qApp->focusWidget());
+	QColor const c = QColorDialog::getColor(QColor(color), qApp->focusWidget());
 
-	if (c.isValid() && c.name() != color) {
+	if (setColor(row, c, color)) {
-		newcolors_[row] = c.name();
+		setDisabledResets();
-		QPixmap coloritem(32, 32);
-		coloritem.fill(c);
-		lyxObjectsLW->currentItem()->setIcon(QIcon(coloritem));
 		// emit signal
 		changed();
 	}
 }
 
+
+void PrefColors::resetColor()
+{
+	int const row = lyxObjectsLW->currentRow();
+
+	// just to be sure
+	if (row < 0)
+		return;
+
+	QString const color = newcolors_[size_t(row)];
+	QColor const c = getDefaultColorByRow(row);
+
+	if (setColor(row, c, color)) {
+		setDisabledResets();
+		// emit signal
+		changed();
+	}
+}
+
+
+void PrefColors::resetAllColor()
+{
+	bool isChanged = false;
+
+	colorResetAllPB->setDisabled(true);
+
+	for (int irow = 0, count = lyxObjectsLW->count(); irow < count; ++irow) {
+		QString const color = newcolors_[size_t(irow)];
+		QColor const c = getDefaultColorByRow(irow);
+
+		if (setColor(irow, c, color))
+			isChanged = true;
+	}
+
+	if (isChanged) {
+		setDisabledResets();
+		// emit signal
+		changed();
+	}
+}
+
+
+bool PrefColors::setColor(int const row, QColor const new_color,
+			  QString const old_color)
+{
+	if (new_color.isValid() && new_color.name() != old_color) {
+		newcolors_[size_t(row)] = new_color.name();
+		QPixmap coloritem(32, 32);
+		coloritem.fill(new_color);
+		lyxObjectsLW->item(row)->setIcon(QIcon(coloritem));
+		return true;
+	}
+	return false;
+}
+
+
+void PrefColors::setDisabledResets()
+{
+	int const row = lyxObjectsLW->currentRow();
+	// set disable reset buttons ...
+	if (row >= 0)
+		colorResetPB->setDisabled(isDefaultColor(row, newcolors_[size_t(row)]));
+
+	colorResetAllPB->setDisabled(true);
+
+	// ... in between process qt events to give quicker visual feedback to the user ...
+	guiApp->processEvents();
+
+	// ... set disable Reset All button
+	for (int irow = 0, count = lyxObjectsLW->count(); irow < count; ++irow) {
+		if (!isDefaultColor(irow, newcolors_[size_t(irow)])) {
+			colorResetAllPB->setDisabled(false);
+			// the break condition might hide performance issues
+			// if a non-default color is at the top of the list
+			break;
+		}
+	}
+}
+
+
+bool PrefColors::isDefaultColor(int const row, QString const color)
+{
+	return color == getDefaultColorByRow(row).name();
+}
+
+
+QColor PrefColors::getDefaultColorByRow(int const row)
+{
+	ColorSet const defaultcolor;
+	return defaultcolor.getX11Name(lcolors_[size_t(row)]).c_str();
+}
+
+
 void PrefColors::changeSysColor()
 {
 	for (int row = 0 ; row < lyxObjectsLW->count() ; ++row) {
 		// skip colors that are taken from system palette
 		bool const disable = syscolorsCB->isChecked()
-			&& guiApp->colorCache().isSystem(lcolors_[row]);
+			&& guiApp->colorCache().isSystem(lcolors_[size_t(row)]);
 
 		QListWidgetItem * const item = lyxObjectsLW->item(row);
 		Qt::ItemFlags const flags = item->flags();
@@ -1226,9 +1322,17 @@ void PrefColors::changeSysColor()
 	}
 }
 
+
 void PrefColors::changeLyxObjectsSelection()
 {
-	colorChangePB->setDisabled(lyxObjectsLW->currentRow() < 0);
+	int currentRow = lyxObjectsLW->currentRow();
+	colorChangePB->setDisabled(currentRow < 0);
+
+	if (currentRow < 0)
+		colorResetPB->setDisabled(true);
+	else
+		colorResetPB->setDisabled(
+			isDefaultColor(currentRow, newcolors_[size_t(currentRow)]));
 }
 
 

src/frontends/qt4/GuiPrefs.h

@@ -255,12 +255,23 @@ public:
 
 private Q_SLOTS:
 	void changeColor();
+	void resetColor();
+	void resetAllColor();
 	void changeSysColor();
 	void changeLyxObjectsSelection();
+	bool setColor(int const row, QColor const new_color,
+		      QString const old_color);
+	bool isDefaultColor(int const row, QString const color);
+	void setDisabledResets();
 
 private:
+	///
+	QColor getDefaultColorByRow(int const row);
+	///
 	std::vector<ColorCode> lcolors_;
+	///
 	std::vector<QString> curcolors_;
+	///
 	std::vector<QString> newcolors_;
 };
 

src/frontends/qt4/ui/PrefColorsUi.ui

@@ -1,3 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
 <ui version="4.0">
  <class>PrefColorsUi</class>
  <widget class="QWidget" name="PrefColorsUi">
@@ -5,7 +6,7 @@
    <rect>
     <x>0</x>
     <y>0</y>
-    <width>339</width>
+    <width>370</width>
     <height>254</height>
    </rect>
   </property>
@@ -19,9 +20,45 @@
    <string/>
   </property>
   <layout class="QGridLayout" name="gridLayout_2">
+   <item row="0" column="2">
+    <spacer name="horizontalSpacer_2">
+     <property name="orientation">
+      <enum>Qt::Horizontal</enum>
+     </property>
+     <property name="sizeHint" stdset="0">
+      <size>
+       <width>40</width>
+       <height>20</height>
+      </size>
+     </property>
+    </spacer>
+   </item>
+   <item row="1" column="0">
+    <widget class="QCheckBox" name="syscolorsCB">
+     <property name="toolTip">
+      <string>Use the color scheme of your Operating System/Desktop Environment</string>
+     </property>
+     <property name="text">
+      <string>&amp;Use system colors</string>
+     </property>
+    </widget>
+   </item>
+   <item row="1" column="1">
+    <spacer name="horizontalSpacer">
+     <property name="orientation">
+      <enum>Qt::Horizontal</enum>
+     </property>
+     <property name="sizeHint" stdset="0">
+      <size>
+       <width>40</width>
+       <height>20</height>
+      </size>
+     </property>
+    </spacer>
+   </item>
    <item row="0" column="0" colspan="2">
     <layout class="QGridLayout" name="gridLayout">
-     <item row="0" column="0" rowspan="2">
+     <item row="0" column="0" rowspan="5">
       <widget class="QListWidget" name="lyxObjectsLW">
        <property name="sizePolicy">
         <sizepolicy hsizetype="MinimumExpanding" vsizetype="Expanding">
@@ -42,12 +79,35 @@
          <verstretch>0</verstretch>
         </sizepolicy>
        </property>
+       <property name="toolTip">
+        <string>Change the selected color</string>
+       </property>
        <property name="text">
         <string>A&amp;lter...</string>
        </property>
       </widget>
      </item>
      <item row="1" column="1">
+      <widget class="QPushButton" name="colorResetPB">
+       <property name="toolTip">
+        <string>Reset the selected color to its original value</string>
+       </property>
+       <property name="text">
+        <string>Restore &amp;Default</string>
+       </property>
+      </widget>
+     </item>
+     <item row="4" column="1">
+      <widget class="QPushButton" name="colorResetAllPB">
+       <property name="toolTip">
+        <string>Reset all colors to their original value</string>
+       </property>
+       <property name="text">
+        <string>Restore A&amp;ll</string>
+       </property>
+      </widget>
+     </item>
+     <item row="3" column="1">
       <spacer>
        <property name="orientation">
         <enum>Qt::Vertical</enum>
@@ -62,39 +122,6 @@
      </item>
     </layout>
    </item>
-   <item row="0" column="2">
-    <spacer name="horizontalSpacer_2">
-     <property name="orientation">
-      <enum>Qt::Horizontal</enum>
-     </property>
-     <property name="sizeHint" stdset="0">
-      <size>
-       <width>40</width>
-       <height>20</height>
-      </size>
-     </property>
-    </spacer>
-   </item>
-   <item row="1" column="0">
-    <widget class="QCheckBox" name="syscolorsCB">
-     <property name="text">
-      <string>&amp;Use system colors</string>
-     </property>
-    </widget>
-   </item>
-   <item row="1" column="1">
-    <spacer name="horizontalSpacer">
-     <property name="orientation">
-      <enum>Qt::Horizontal</enum>
-     </property>
-     <property name="sizeHint" stdset="0">
-      <size>
-       <width>40</width>
-       <height>20</height>
-      </size>
-     </property>
-    </spacer>
-   </item>
   </layout>
  </widget>
  <includes>