GuiPrefs:

- implement an UI to specify the size of InstantPreview images
- change the default size to 1.0 because we've got many complaints that the former default size of 0.9 was too low

Both changes fix #6176.

git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@31425 a592a061-630c-0410-9148-cb99ea01b6c8

src/LyXRC.cpp

@@ -243,7 +243,7 @@ void LyXRC::setDefaults()
 	index_command = "makeindex -c -q";
 	nomencl_command = "makeindex -s nomencl.ist";
 	dpi = 75;
-	// Because a screen typically is wider than a piece of paper:
+	// Because a screen is typically wider than a piece of paper:
 	zoom = 150;
 	allow_geometry_session = true;
 	// Default LaTeX font size:
@@ -306,7 +306,7 @@ void LyXRC::setDefaults()
 	label_init_length = 3;
 	preview = PREVIEW_OFF;
 	preview_hashed_labels  = false;
-	preview_scale_factor = "0.9";
+	preview_scale_factor = 1.0;
 	use_converter_cache = true;
 	use_tooltip = true;
 	use_pixmap_cache = false;

src/LyXRC.h

@@ -423,7 +423,7 @@ public:
 	///
 	bool preview_hashed_labels;
 	///
-	std::string preview_scale_factor;
+	double preview_scale_factor;
 	/// user name
 	std::string user_name;
 	/// user email

src/frontends/qt4/GuiPrefs.cpp

@@ -1071,7 +1071,21 @@ PrefDisplay::PrefDisplay(GuiPreferences * form)
 	setupUi(this);
 	connect(displayGraphicsCB, SIGNAL(toggled(bool)), this, SIGNAL(changed()));
 	connect(instantPreviewCO, SIGNAL(activated(int)), this, SIGNAL(changed()));
+	connect(previewSizeSB, SIGNAL(valueChanged(double)), this, SIGNAL(changed()));
 	connect(paragraphMarkerCB, SIGNAL(toggled(bool)), this, SIGNAL(changed()));
+	if (instantPreviewCO->currentIndex() == 0)
+		previewSizeSB->setEnabled(false);
+	else
+		previewSizeSB->setEnabled(true);
+}
+
+
+void PrefDisplay::on_instantPreviewCO_currentIndexChanged(int index)
+{
+	if (index == 0)
+		previewSizeSB->setEnabled(false);
+	else
+		previewSizeSB->setEnabled(true);
 }
 
 
@@ -1084,6 +1098,7 @@ void PrefDisplay::apply(LyXRC & rc) const
 	}
 
 	rc.display_graphics = displayGraphicsCB->isChecked();
+	rc.preview_scale_factor = previewSizeSB->value();
 	rc.paragraph_markers = paragraphMarkerCB->isChecked();
 
 	// FIXME!! The graphics cache no longer has a changeDisplay method.
@@ -1112,6 +1127,7 @@ void PrefDisplay::update(LyXRC const & rc)
 
 	displayGraphicsCB->setChecked(rc.display_graphics);
 	instantPreviewCO->setEnabled(rc.display_graphics);
+	previewSizeSB->setValue(rc.preview_scale_factor);
 	paragraphMarkerCB->setChecked(rc.paragraph_markers);
 }
 

src/frontends/qt4/GuiPrefs.h

@@ -281,6 +281,9 @@ public:
 
 	void apply(LyXRC & rc) const;
 	void update(LyXRC const & rc);
+
+private Q_SLOTS:
+	void on_instantPreviewCO_currentIndexChanged(int);
 };
 
 

src/frontends/qt4/ui/PrefDisplayUi.ui

@@ -5,7 +5,7 @@
    <rect>
     <x>0</x>
     <y>0</y>
-    <width>340</width>
+    <width>356</width>
     <height>133</height>
    </rect>
   </property>
@@ -20,14 +20,14 @@
      </property>
     </widget>
    </item>
-   <item rowspan="2" row="0" column="2" >
-    <spacer>
+   <item row="0" column="4" rowspan="4">
+    <spacer name="spacer_1">
      <property name="orientation">
       <enum>Qt::Horizontal</enum>
      </property>
      <property name="sizeHint" stdset="0">
       <size>
-       <width>40</width>
+       <width>57</width>
        <height>20</height>
       </size>
      </property>
@@ -62,6 +62,44 @@
      </item>
     </widget>
    </item>
+   <item row="1" column="2">
+    <widget class="QLabel" name="previewSizeLA">
+     <property name="text">
+      <string>Preview Si&amp;ze:</string>
+     </property>
+     <property name="buddy">
+      <cstring>instantPreviewCO</cstring>
+     </property>
+    </widget>
+   </item>
+   <item row="1" column="3">
+    <widget class="QDoubleSpinBox" name="previewSizeSB">
+     <property name="sizePolicy">
+      <sizepolicy hsizetype="Preferred" vsizetype="Fixed">
+       <horstretch>0</horstretch>
+       <verstretch>0</verstretch>
+      </sizepolicy>
+     </property>
+     <property name="toolTip">
+      <string>factor for the preview size</string>
+     </property>
+     <property name="decimals">
+      <number>1</number>
+     </property>
+     <property name="minimum">
+      <double>0.100000000000000</double>
+     </property>
+     <property name="maximum">
+      <double>10.000000000000000</double>
+     </property>
+     <property name="singleStep">
+      <double>0.100000000000000</double>
+     </property>
+     <property name="value">
+      <double>1.000000000000000</double>
+     </property>
+    </widget>
+   </item>
    <item row="2" column="0" colspan="2">
     <widget class="QCheckBox" name="paragraphMarkerCB">
      <property name="text">
@@ -69,21 +107,8 @@
      </property>
     </widget>
    </item>
-   <item rowspan="2" row="0" column="2" >
-    <spacer>
-     <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="3" column="0" colspan="2" >
-    <spacer>
+   <item row="3" column="0">
+    <spacer name="spacer_2">
      <property name="orientation">
       <enum>Qt::Vertical</enum>
      </property>

src/graphics/PreviewLoader.cpp

@@ -390,7 +390,7 @@ PreviewLoader::Impl::Impl(PreviewLoader & p, Buffer const & b)
 	: parent_(p), buffer_(b), font_scaling_factor_(0.0)
 {
 	font_scaling_factor_ = 0.01 * lyxrc.dpi * lyxrc.zoom *
-		convert<double>(lyxrc.preview_scale_factor);
+		lyxrc.preview_scale_factor;
 
 	LYXERR(Debug::GRAPHICS, "The font scaling factor is "
 				<< font_scaling_factor_);