add helpful info to GdalTools Settings dialog on how to configure GDA…

…L path

python/plugins/GdalTools/resources.qrc

@@ -24,5 +24,6 @@
         <file>icons/fillnodata.png</file>
         <file>icons/edit.png</file>
         <file>icons/reset.png</file>
+        <file>icons/tooltip.png</file>
     </qresource>
 </RCC>

python/plugins/GdalTools/tools/dialogSettings.ui

@@ -7,19 +7,36 @@
     <x>0</x>
     <y>0</y>
     <width>368</width>
-    <height>324</height>
+    <height>337</height>
    </rect>
   </property>
   <property name="windowTitle">
    <string>Gdal Tools settings</string>
   </property>
   <layout class="QVBoxLayout" name="verticalLayout">
    <item>
-    <widget class="QLabel" name="label">
-     <property name="text">
-      <string>Path to the GDAL binaries</string>
-     </property>
-    </widget>
+    <layout class="QHBoxLayout" name="horizontalLayout_6">
+     <item>
+      <widget class="QLabel" name="label">
+       <property name="text">
+        <string>Path to the GDAL binaries</string>
+       </property>
+      </widget>
+     </item>
+     <item>
+      <widget class="QLabel" name="bin_tooltip_label">
+       <property name="sizePolicy">
+        <sizepolicy hsizetype="Expanding" vsizetype="Preferred">
+         <horstretch>0</horstretch>
+         <verstretch>0</verstretch>
+        </sizepolicy>
+       </property>
+       <property name="text">
+        <string notr="true">##tooltip icon##</string>
+       </property>
+      </widget>
+     </item>
+    </layout>
    </item>
    <item>
     <layout class="QHBoxLayout" name="horizontalLayout">
@@ -36,11 +53,28 @@
     </layout>
    </item>
    <item>
-    <widget class="QLabel" name="label_5">
-     <property name="text">
-      <string>GDAL help path</string>
-     </property>
-    </widget>
+    <layout class="QHBoxLayout" name="horizontalLayout_7">
+     <item>
+      <widget class="QLabel" name="label_5">
+       <property name="text">
+        <string>GDAL help path</string>
+       </property>
+      </widget>
+     </item>
+     <item>
+      <widget class="QLabel" name="help_tooltip_label">
+       <property name="sizePolicy">
+        <sizepolicy hsizetype="Expanding" vsizetype="Preferred">
+         <horstretch>0</horstretch>
+         <verstretch>0</verstretch>
+        </sizepolicy>
+       </property>
+       <property name="text">
+        <string notr="true">##tooltip icon##</string>
+       </property>
+      </widget>
+     </item>
+    </layout>
    </item>
    <item>
     <layout class="QHBoxLayout" name="horizontalLayout_5">

python/plugins/GdalTools/tools/doSettings.py

@@ -8,18 +8,34 @@
 from ui_dialogSettings import Ui_GdalToolsSettingsDialog as Ui_Dialog
 import GdalTools_utils as Utils
 
+from .. import resources_rc
+
 class GdalToolsSettingsDialog( QDialog, Ui_Dialog ):
   def __init__( self, iface ):
     QDialog.__init__( self, iface.mainWindow() )
     self.setAttribute(Qt.WA_DeleteOnClose)
     self.iface = iface
     self.setupUi( self )
 
+    # binaries
     self.leGdalBinPath.setText( Utils.getGdalPath() )
-    self.leGdalHelpPath.setText( Utils.getHelpPath() )
-
     QObject.connect( self.btnSetBinPath, SIGNAL( "clicked()" ), self.setBinPath )
+    self.bin_tooltip_label.setPixmap( QPixmap(':/icons/tooltip.png') )
+    self.bin_tooltip_label.setToolTip( self.tr( \
+u"""A list of colon-separated (Linux and MacOS) or 
+semicolon-separated (Windows) paths to executables.
+
+MacOS users usually need to set it to something like
+/Library/Frameworks/GDAL.framework/Versions/1.8/Programs""") )
+
+    # help
+    self.leGdalHelpPath.setText( Utils.getHelpPath() )
     QObject.connect( self.btnSetHelpPath, SIGNAL( "clicked()" ), self.setHelpPath )
+    self.help_tooltip_label.setPixmap( QPixmap(':/icons/tooltip.png') )
+    self.help_tooltip_label.setToolTip( self.tr( \
+u"""Useful to open local GDAL documentation instead of online help 
+when pressing on the tool dialog's Help button.""") )
+
 
   def setBinPath( self ):
     inputDir = Utils.FileDialog.getExistingDirectory( self, self.tr( "Select directory with GDAL executables" ) )