Android: make keyboard appear and disappear only on demand

client/lobby/SelectionTab.cpp

@@ -268,10 +268,14 @@ void SelectionTab::clickLeft(tribool down, bool previousState)
 	if(down)
 	{
 		int line = getLine();
+
 		if(line != -1)
+		{
 			select(line);
 		}
 	}
+}
+
 void SelectionTab::keyPressed(const SDL_KeyboardEvent & key)
 {
 	if(key.state != SDL_PRESSED)

client/widgets/TextControls.cpp

@@ -175,15 +175,15 @@ void CTextContainer::blitLine(SDL_Surface *to, Rect destRect, std::string what)
 			where.x += (int)f->getStringWidth(toPrint);
 		}
 		currDelimeter++;
-	}
-	while (begin++ != std::string::npos);
+	} while(begin++ != std::string::npos);
 }
 
 CTextContainer::CTextContainer(EAlignment alignment, EFonts font, SDL_Color color) :
 	alignment(alignment),
 	font(font),
 	color(color)
-{}
+{
+}
 
 void CMultiLineLabel::showAll(SDL_Surface * to)
 {
@@ -410,33 +410,41 @@ void CGStatusBar::lock(bool shouldLock)
 
 CTextInput::CTextInput(const Rect & Pos, EFonts font, const CFunctionList<void(const std::string &)> & CB)
 	: CLabel(Pos.x, Pos.y, font, CENTER),
-	cb(CB)
+	cb(CB),
+	CFocusable(std::make_shared<CKeyboardFocusListener>(this))
 {
 	type |= REDRAW_PARENT;
-	focus = false;
 	pos.h = Pos.h;
 	pos.w = Pos.w;
 	captureAllKeys = true;
 	background.reset();
 	addUsedEvents(LCLICK | KEYBOARD | TEXTINPUT);
+
+#ifndef VCMI_ANDROID
 	giveFocus();
+#endif
 }
 
 CTextInput::CTextInput(const Rect & Pos, const Point & bgOffset, const std::string & bgName, const CFunctionList<void(const std::string &)> & CB)
-	:cb(CB)
+	:cb(CB), 	CFocusable(std::make_shared<CKeyboardFocusListener>(this))
 {
-	focus = false;
 	pos += Pos;
+	pos.h = Pos.h;
+	pos.w = Pos.w;
+
 	captureAllKeys = true;
 	OBJ_CONSTRUCTION;
 	background = std::make_shared<CPicture>(bgName, bgOffset.x, bgOffset.y);
 	addUsedEvents(LCLICK | KEYBOARD | TEXTINPUT);
+
+#ifndef VCMI_ANDROID
 	giveFocus();
+#endif
 }
 
 CTextInput::CTextInput(const Rect & Pos, SDL_Surface * srf)
+	:CFocusable(std::make_shared<CKeyboardFocusListener>(this))
 {
-	focus = false;
 	pos += Pos;
 	captureAllKeys = true;
 	OBJ_CONSTRUCTION;
@@ -450,22 +458,35 @@ CTextInput::CTextInput(const Rect & Pos, SDL_Surface * srf)
 	pos.h = background->pos.h;
 	background->pos = pos;
 	addUsedEvents(LCLICK | KEYBOARD | TEXTINPUT);
-	giveFocus();
-}
 
-void CTextInput::focusGot()
-{
-	CSDL_Ext::startTextInput(&pos);
-#ifdef VCMI_ANDROID
-	notifyAndroidTextInputChanged(text);
+#ifndef VCMI_ANDROID
+	giveFocus();
 #endif
 }
 
-void CTextInput::focusLost()
+std::atomic<int> CKeyboardFocusListener::usageIndex(0);
+
+CKeyboardFocusListener::CKeyboardFocusListener(CTextInput * textInput)
+	:textInput(textInput)
+{
+}
+
+void CKeyboardFocusListener::focusGot()
+{
+	CSDL_Ext::startTextInput(&textInput->pos);
+#ifdef VCMI_ANDROID
+	textInput->notifyAndroidTextInputChanged(textInput->text);
+#endif
+	usageIndex++;
+}
+
+void CKeyboardFocusListener::focusLost()
+{
+	if(0 == --usageIndex)
 	{
 		CSDL_Ext::stopTextInput();
 	}
-
+}
 
 std::string CTextInput::visibleText()
 {
@@ -641,6 +662,12 @@ void CTextInput::notifyAndroidTextInputChanged(std::string & text)
 #endif //VCMI_ANDROID
 
 CFocusable::CFocusable()
+	:CFocusable(std::make_shared<IFocusListener>())
+{
+}
+
+CFocusable::CFocusable(std::shared_ptr<IFocusListener> focusListener)
+	: focusListener(focusListener)
 {
 	focus = false;
 	focusables.push_back(this);
@@ -648,24 +675,30 @@ CFocusable::CFocusable()
 
 CFocusable::~CFocusable()
 {
-	if(inputWithFocus == this)
+	if(hasFocus())
 	{
-		focusLost();
 		inputWithFocus = nullptr;
+		focusListener->focusLost();
 	}
 
 	focusables -= this;
 }
 
+bool CFocusable::hasFocus() const
+{
+	return inputWithFocus == this;
+}
+
 void CFocusable::giveFocus()
 {
 	focus = true;
-	focusGot();
+	focusListener->focusGot();
 	redraw();
 
 	if(inputWithFocus)
 	{
 		inputWithFocus->focus = false;
+		inputWithFocus->focusListener->focusLost();
 		inputWithFocus->redraw();
 	}
 

client/widgets/TextControls.h

@@ -140,24 +140,50 @@ public:
 	void lock(bool shouldLock); //If true, current text cannot be changed until lock(false) is called
 };
 
+class CFocusable;
+
+class IFocusListener
+{
+public:
+	virtual void focusGot() {};
+	virtual void focusLost() {};
+	virtual ~IFocusListener() = default;
+};
+
 /// UIElement which can get input focus
 class CFocusable : public virtual CIntObject
 {
-protected:
-	virtual void focusGot(){};
-	virtual void focusLost(){};
+private:
+	std::shared_ptr<IFocusListener> focusListener;
+
 public:
 	bool focus; //only one focusable control can have focus at one moment
 
 	void giveFocus(); //captures focus
 	void moveFocus(); //moves focus to next active control (may be used for tab switching)
+	bool hasFocus() const;
 
 	static std::list<CFocusable *> focusables; //all existing objs
 	static CFocusable * inputWithFocus; //who has focus now
+
 	CFocusable();
+	CFocusable(std::shared_ptr<IFocusListener> focusListener);
 	~CFocusable();
 };
 
+class CTextInput;
+class CKeyboardFocusListener : public IFocusListener
+{
+private:
+	static std::atomic<int> usageIndex;
+	CTextInput * textInput;
+
+public:
+	CKeyboardFocusListener(CTextInput * textInput);
+	void focusGot() override;
+	void focusLost() override;
+};
+
 /// Text input box where players can enter text
 class CTextInput : public CLabel, public CFocusable
 {
@@ -165,9 +191,6 @@ class CTextInput : public CLabel, public CFocusable
 protected:
 	std::string visibleText() override;
 
-	void focusGot() override;
-	void focusLost() override;
-
 #ifdef VCMI_ANDROID
 	void notifyAndroidTextInputChanged(std::string & text);
 #endif
@@ -192,4 +215,6 @@ public:
 	//Filter that will allow only input of numbers in range min-max (min-max are allowed)
 	//min-max should be set via something like std::bind
 	static void numberFilter(std::string & text, const std::string & oldText, int minValue, int maxValue);
+
+	friend class CKeyboardFocusListener;
 };