EXT-7961 FIXED Added possibility to show label on the back button in Edit Wearables panel.

Implemented behavior:
 * Normally Back button appears narrow without label
 * When wearable is changed - "Save" label is set and button gets wide. Left Border of Title is moved to the right.
   Note: "Save" label is shown without truncation in all languages, Title can be truncated with dots.
 * When changes are saved/reverted - label is removed, button shrinks, Title left border is moved to the its default place.
 * Added consistent tooltip for title (the same as a title).
 * Added tooltip for button: "Save changes if necessary and return back"

Details:
 * added getter for button's font
 * implemented derived from LLButton class for Back button to enable setting necessary label's padding in xml

Reviewed by Neal Orman at https://codereview.productengine.com/secondlife/r/636/

--HG--
branch : product-engine

1 files changed, 50 insertions, 0 deletions

diff --git a/indra/newview/llpaneleditwearable.cpp b/indra/newview/llpaneleditwearable.cpp
index ae54909945..5c85ea849e 100644
--- a/indra/newview/llpaneleditwearable.cpp
+++ b/indra/newview/llpaneleditwearable.cpp
@@ -382,6 +382,31 @@ LLEditWearableDictionary::PickerControlEntry::PickerControlEntry(ETextureIndex t
 {
 }
 
+/**
+ * Class to prevent hack in LLButton's constructor and use paddings declared in xml.
+ */
+class LLLabledBackButton : public LLButton
+{
+public:
+	struct Params : public LLInitParam::Block<Params, LLButton::Params>
+	{
+		Params() {}
+	};
+protected:
+	friend class LLUICtrlFactory;
+	LLLabledBackButton(const Params&);
+};
+
+static LLDefaultChildRegistry::Register<LLLabledBackButton> labeled_back_btn("labeled_back_button");
+
+LLLabledBackButton::LLLabledBackButton(const Params& params)
+: LLButton(params)
+{
+	// override hack in LLButton's constructor to use paddings have been set in xml
+	setLeftHPad(params.pad_left);
+	setRightHPad(params.pad_right);
+}
+
 // Helper functions.
 static const texture_vec_t null_texture_vec;
 
@@ -649,6 +674,8 @@ BOOL LLPanelEditWearable::postBuild()
 	mBtnRevert->setClickedCallback(boost::bind(&LLPanelEditWearable::onRevertButtonClicked, this));
 
 	mBtnBack = getChild<LLButton>("back_btn");
+	mBackBtnLabel = mBtnBack->getLabelUnselected();
+	mBtnBack->setLabel(LLStringUtil::null);
 	// handled at appearance panel level?
 	//mBtnBack->setClickedCallback(boost::bind(&LLPanelEditWearable::onBackButtonClicked, this));
 
@@ -1016,6 +1043,7 @@ void LLPanelEditWearable::showWearable(LLWearable* wearable, BOOL show)
 	if (show)
 	{
 		mPanelTitle->setText(title);
+		mPanelTitle->setToolTip(title);
 		mDescTitle->setText(description_title);
 		
 		// set name
@@ -1357,6 +1385,28 @@ void LLPanelEditWearable::updateVerbs()
 		gSavedSettings.setU32("AvatarSex", (gAgentAvatarp->getSex() == SEX_MALE) );
 	}
 
+	// update back button and title according to dirty state.
+	static BOOL was_dirty = FALSE;
+	if (was_dirty != is_dirty) // to avoid redundant changes because this method is called from draw
+	{
+		static S32 label_width = mBtnBack->getFont()->getWidth(mBackBtnLabel);
+		const std::string& label = is_dirty ? mBackBtnLabel : LLStringUtil::null;
+		const S32 delta_width = is_dirty ? label_width : -label_width;
+
+		mBtnBack->setLabel(label);
+
+		// update rect according to label width
+		LLRect rect = mBtnBack->getRect();
+		rect.mRight += delta_width;
+		mBtnBack->setShape(rect);
+
+		// update title rect according to back button width
+		rect = mPanelTitle->getRect();
+		rect.mLeft += delta_width;
+		mPanelTitle->setShape(rect);
+
+		was_dirty = is_dirty;
+	}
 }
 
 void LLPanelEditWearable::configureAlphaCheckbox(LLVOAvatarDefines::ETextureIndex te, const std::string& name)