some progress concerning IMGUI widgets (added simple text input)

asteroids/AsteroidsEvents.h

@@ -10,6 +10,7 @@ BEGIN_ENUM(Event)
 	DECL_ENUM_ELEMENT(EventAccelerateStart),
 	DECL_ENUM_ELEMENT(EventAccelerateStop),
 	DECL_ENUM_ELEMENT(EventLevelComplete),
+	DECL_ENUM_ELEMENT(EventChangeGameState),
 	DECL_ENUM_ELEMENT(EventGameOver),
 	DECL_ENUM_ELEMENT(EventShipExplode)
 }

asteroids/Controller.cc

@@ -1,4 +1,5 @@
 #include "Controller.h"
+#include "AsteroidsEvents.h"
 
 namespace asteroids {
 
@@ -16,7 +17,16 @@ int Controller::OnInit (int argc, char *argv[]) {
 	mBindings[SDLK_F8] = "toggleconsole";
 	mBindings[SDLK_F9] = "set playerspeed 5.0";
 
+	Engine::RegisterListener (this, EventChangeGameState);
+
 	return 0;
 }
 
+bool Controller::OnReceiveEvent (const Engine::EventBasePtr &event) {
+	if (event->mEventType == EventChangeGameState) {
+		IMGUIClear();
+	}
+	return false;
+}
+
 }

asteroids/Controller.h

@@ -26,6 +26,7 @@ class Controller : public Engine::ControllerBase {
 		virtual int OnInit (int argc, char* argv[]);
 		/** \brief Registers the commands of the cnotroller */
 		virtual void OnRegisterCommands ();
+		virtual bool OnReceiveEvent (const Engine::EventBasePtr &event);
 };
 
 }

asteroids/Model.cc

@@ -359,6 +359,15 @@ int Model::DoSaveLevel (const char* filename) {
 	level_file.close();
 	return 0;
 }
+void Model::SetGameState (const unsigned int &state) {
+	mLastGameState = mGameState;
+
+	Engine::EventBasePtr changegamestate_event (new Engine::EventBase());
+	changegamestate_event->mEventType = EventChangeGameState;
+	QueueEvent (changegamestate_event);
+
+	mGameState = state;
+}
 
 bool Model::OnLevelComplete() {
 	Engine::LogMessage ("Level complete!");

asteroids/Model.h

@@ -17,10 +17,15 @@ class Model : public Engine::ModelBase {
 		/** \brief Resets values from a previous game */
 		void OnNewGame ();
 
+		virtual void SetGameState (const unsigned int &state);
+
 		int GetPlayerLives () { return mPlayerLives; };
 		unsigned int GetPoints () { return mPoints; };
 		std::string GetPlayerName() { return mPlayerName; };
-		void SetPlayerName(const std::string &name) { mPlayerName = name; };
+		void SetPlayerName(const std::string &name) {
+			Engine::LogDebug("new player name: %s", name.c_str());
+			mPlayerName = name;
+		};
 
 		float GetWorldWidth ();
 		float GetWorldHeight ();

asteroids/UserInterface.cc

@@ -33,19 +33,9 @@ void MainMenuOverlay::Init () {
 }
 
 bool MainMenuOverlay::OnKeyDown (const SDL_keysym &keysym) {
-	switch (keysym.sym) {
+	if (keysym.sym == SDLK_ESCAPE)
-		case SDLK_ESCAPE:
+		Engine::RunCommand("quit");
-			Engine::RunCommand ("quit");
+	return false;
-			return true;
-		case SDLK_RETURN:
-			GetModel()->SetGameState(GameStateEnterPlayername);
-			return true;
-		case SDLK_h:
-			GetModel()->SetGameState(GameStateShowHighscore);
-			return true;
-		default:
-			return true;
-	}
 }
 
 void MainMenuOverlay::Draw () {
@@ -70,16 +60,16 @@ void MainMenuOverlay::Draw () {
 	glPushMatrix ();
 	glLoadIdentity ();
 
-//	Engine::DrawGLString ( right * 0.5 - 100, 100, "A s t e r o i d s");
-
 	Engine::GUI::Label (4, "A s t e r o i d s", right * 0.5 - 100, 180);
 
-	if (Engine::GUI::Button (1, "Start Game", right * 0.5 - 100, 200, 250, 40)) {
+	if (Engine::GUI::Button (1, "New Game", right * 0.5 - 100, 200, 250, 40)) {
 		GetModel()->SetGameState(GameStateEnterPlayername);
+		GetController()->uistate.hotitem = 0;
 	}
 
 	if (Engine::GUI::Button (2, "Highscores", right * 0.5 - 100, 250, 250, 40)) {
 		GetModel()->SetGameState(GameStateShowHighscore);
+		GetController()->uistate.hotitem = 0;
 	}
 
 	if (Engine::GUI::Button (3, "Quit", right * 0.5 - 100, 330, 250, 40)) {
@@ -88,13 +78,6 @@ void MainMenuOverlay::Draw () {
 
 	GetView()->SelectFont("console.ttf");
 
-/*	
-	// then we do the drawings
-	Engine::DrawGLString ( right * 0.5 - 100, bottom * 0.5 - 8 - 32, "Main Menu");
-	Engine::DrawGLString ( right * 0.5 - 80, bottom * 0.5 - 8 - 16, "[Return] - Start Game");
-	Engine::DrawGLString ( right * 0.5 - 80, bottom * 0.5 - 8, "[h]      - Show Highscore");
-	Engine::DrawGLString ( right * 0.5 - 80, bottom * 0.5 + 8, "[Escape] - Quit");
-*/
 	glPopMatrix ();
 
 	glMatrixMode (GL_PROJECTION);
@@ -553,39 +536,13 @@ void EnterPlayernameOverlay::Init () {
 }
 
 bool EnterPlayernameOverlay::OnKeyDown (const SDL_keysym &keysym) {
-	GetController()->EnableTextinput(true);
+	if (keysym.sym == SDLK_ESCAPE) {
-
+		GetModel()->SetGameState(GameStateMainMenu);
-	switch (keysym.sym) {
+		GetController()->uistate.hotitem = 0;
-		case SDLK_ESCAPE:
+		return true;
-			GetModel()->SetGameState(GameStateMainMenu);
-			return true;
-		case SDLK_BACKSPACE:
-			if (mPlayerNameInput.size() > 0)
-				mPlayerNameInput = mPlayerNameInput.substr (0, mPlayerNameInput.size() - 1 );
-			return true;
-			break;
-		case SDLK_RETURN:
-			// If we just entered a new entry we simply show the highscore table,
-			// otherwise we switch back to the main menu
-			GetModel()->SetPlayerName(mPlayerNameInput);
-			GetController()->EnableTextinput(false);
-			GetModel()->SetGameState(GameStateRunning);
-			return true;
-		default:
-			break;
 	}
 
-	if (keysym.unicode) {	
+	return false;
-		if ((keysym.unicode & 0xFF80) == 0) {
-			mPlayerNameInput += keysym.unicode & 0x7F;
-			return true;
-		} else {
-			Engine::LogWarning ("Input key not supported!");
-			return false;
-		}
-	}
-
-	return true;
 }
 
 void EnterPlayernameOverlay::Draw () {
@@ -611,21 +568,28 @@ void EnterPlayernameOverlay::Draw () {
 	glLoadIdentity ();
 
 	GetView()->SelectFont("console.ttf");
-	float x = right * 0.5 - 100;
-	float y = bottom * 0.5 - 8 - 128;
 
-	// then we do the drawings
+	Engine::GUI::Label (4, "A s t e r o i d s", right * 0.5 - 100, 180);
-	Engine::DrawGLString ( x, y, "A s t e r o i d s");
-	y += 30;
-	Engine::DrawGLString ( x, y, "Enter your name: ");
 
-	std::string name_output (mPlayerNameInput);
+	Engine::GUI::Label (1, "Enter your name: ", right * 0.5 - 100, 250);
-	if (SDL_GetTicks() >> 9 & 1)
+
-		name_output += "_";
+	// Make sure we have UNICODE processing enabled!
+	GetController()->EnableTextinput(true);
+
+	std::string player_name = GetModel()->GetPlayerName();
+	if (Engine::GUI::LineEdit (2, right * 0.5 + 20, 238, player_name, 16)) {
+		GetModel()->SetPlayerName(player_name);
+	}
+
+	if (Engine::GUI::Button (3, "Start Game", right - 150 - 20, 500, 150, 40)) {
+		GetModel()->SetGameState(GameStateRunning);
+	}
+
+	if (Engine::GUI::Button (5, "Back", 20, 500, 150, 40)) {
+		GetModel()->SetGameState(GameStateMainMenu);
+		GetController()->uistate.hotitem = 0;
+	}
 
-	Engine::DrawGLString ( x + 15*8, y, name_output.c_str()); 
-	Engine::DrawGLString ( x + 16, y + 16, "Press [Return] to continue.");
-	
 	glPopMatrix ();
 
 	glMatrixMode (GL_PROJECTION);

engine/ControllerBase.cc

@@ -57,6 +57,12 @@ int ControllerBase::OnInit (int argc, char* argv[]) {
 	uistate.activeitem = 0;
 	uistate.hotitem = 0;
 
+	uistate.kbditem = 0;
+	uistate.last_keysym = SDLK_CLEAR;
+	uistate.last_unicode = 0;
+
+	uistate.lastwidget = 0;
+
 	ControllerInstance = this;
 
 	return 0;
@@ -158,6 +164,12 @@ void ControllerBase::IMGUIFinish () {
 /** \brief Keyboard processing */
 bool ControllerBase::OnKeyDown (const SDL_keysym &keysym) {
 	mButtonStates.set(keysym.sym, true);
+	uistate.last_keysym = keysym.sym;
+
+	// Only when Unicode processing is activated store the unicode value
+	if (SDL_EnableUNICODE(-1)) {
+		uistate.last_unicode = keysym.unicode;
+	}
 
 	if (mView->mOverlayManager.SendKeyDown (keysym))
 		return true;

engine/ControllerBase.h

@@ -16,6 +16,12 @@ class Module;
 struct UIState {
 	int hotitem;
 	int activeitem;
+
+	int kbditem;
+	SDLKey last_keysym;
+	Uint16 last_unicode;
+
+	int lastwidget;
 };
 
 /** \brief Defines the number of keys (keyboard + mous) that we can bind to.
@@ -67,6 +73,11 @@ class ControllerBase : public Module {
 		void IMGUIPrepare () {
 			uistate.hotitem = 0;
 		}
+		void IMGUIClear () {
+			LogMessage ("Called IMGUIClear()");
+			uistate.hotitem = 0;
+			uistate.kbditem = 0;
+		}
 		void IMGUIFinish ();
 
 		UIState uistate;

engine/IMGUIControls.cc

@@ -30,6 +30,15 @@ bool regionhit (int x, int y, int w, int h) {
 	return true;
 }
 
+/** \brief Draws a label with a given caption at the position (vertically centered)
+ *
+ * This function draws the label at the horizontal x position and centers the
+ * label with regard to the height of the rendered caption.
+ *
+ * \TODO [med] The vertical alignment around the center of the vertical height
+ * of the string is rather unfortunate as different contents will be rendered
+ * at different vertical positions (e.g. "aaa" and "ggg") 
+ */
 void Label (int id, const char* caption, int x, int y) {
 	if (caption != NULL) {
 		float width, height;
@@ -43,6 +52,9 @@ void Label (int id, const char* caption, int x, int y) {
 }
 
 /** \brief Draws a button at the given position
+ *
+ * The area defined by the parameters defines the clickable area. However
+ * decorations might be drawn on a smaller or bigger area.
  *
  * \returns true if it was clicked
  *
@@ -51,6 +63,8 @@ bool Button (int id, const char* caption, int x, int y, int w, int h) {
 	controller = EngineGetController();
 	assert (controller);
 
+//	LogMessage ("id = %d hotitem = %d activeitem = %d kbditem = %d", id, controller->uistate.hotitem, controller->uistate.activeitem, controller->uistate.kbditem);
+
 	// Check for hotness
 	if (regionhit (x, y, w, h)) {
 		controller->uistate.hotitem = id;
@@ -59,11 +73,22 @@ bool Button (int id, const char* caption, int x, int y, int w, int h) {
 			controller->uistate.activeitem = id;
 	}
 
+	// If nothing is selected
+	if (controller->uistate.hotitem != 0) {
+		controller->uistate.kbditem = controller->uistate.hotitem;
+	}
+
+	if (controller->uistate.kbditem == 0) {
+		controller->uistate.hotitem = id;
+		controller->uistate.kbditem = id;
+	}
+
 	// Render
 	glColor3f (0.2, 0.2, 0.2);
 	DrawRect2D (x + 4, y + 4, w, h);
 
-	if (controller->uistate.hotitem == id) {
+	if (controller->uistate.hotitem == id 
+			|| controller->uistate.kbditem == id) {
 		if (controller->uistate.activeitem == id) {
 			glColor3f (0.8, 0.8, 0.8);
 			DrawRect2D (x, y, w, h);
@@ -87,11 +112,179 @@ bool Button (int id, const char* caption, int x, int y, int w, int h) {
 		view->DrawGLString(x + w * 0.5 - width * 0.5, y + h * 0.5 - height * 0.5, caption);
 	}
 
-	// Logic
+	// Mouse Logic
 	if (controller->GetButtonState(MouseButtonLeft) == false
 			&& controller->uistate.hotitem == id
-			&& controller->uistate.activeitem == id)
+			&& controller->uistate.activeitem == id) {
+		controller->uistate.lastwidget = id;
+
 		return true;
+	}
+
+	// Keyboard Logic
+	if (controller->uistate.kbditem == id) {
+		// We have to make sure, that we always clear the uistate.last_keysym
+		// value, otherwise the same action might be repeated over and over.
+		switch (controller->uistate.last_keysym) {
+			case SDLK_DOWN:
+				controller->uistate.kbditem = 0;
+				controller->uistate.hotitem = 0;
+				controller->uistate.last_keysym = SDLK_CLEAR;
+				break;
+			case SDLK_UP:
+				controller->uistate.kbditem = controller->uistate.lastwidget;
+				controller->uistate.hotitem = controller->uistate.lastwidget;
+				controller->uistate.last_keysym = SDLK_CLEAR;
+				break;
+			case SDLK_RETURN:
+				controller->uistate.last_keysym = SDLK_CLEAR;
+				// As we (probably) exit the current set of widgets, we have to clear
+				// the uistate.kbditem value.
+				controller->uistate.kbditem = 0;
+				return true;
+				break;
+		}
+	}
+
+	controller->uistate.lastwidget = id;
+
+	return false;
+}
+
+/** \brief An Edit widget that allows editing of a string consisting of one line 
+ *
+ * \TODO [med] vertical alignment (especially of text) is a bit whacky
+ *
+ * \returns true if it was clicked
+ *
+ */
+bool LineEdit (int id, int x, int y, std::string &text_value, const int &maxlength) {
+	controller = EngineGetController();
+	assert (controller);
+
+	int w = maxlength * 16;
+	int h = 16;
+
+	// LogMessage ("id = %d hotitem = %d activeitem = %d kbditem = %d", id, controller->uistate.hotitem, controller->uistate.activeitem, controller->uistate.kbditem); 
+
+	// Check for hotness
+	if (regionhit (x, y, w, h)) {
+		controller->uistate.hotitem = id;
+		if (controller->uistate.activeitem == 0 
+				&& controller->GetButtonState(MouseButtonLeft))
+			controller->uistate.activeitem = id;
+	}
+
+	// If nothing is selected
+	if (controller->uistate.hotitem != 0) {
+		controller->uistate.kbditem = controller->uistate.hotitem;
+	}
+
+	if (controller->uistate.kbditem == 0) {
+		controller->uistate.hotitem = id;
+		controller->uistate.kbditem = id;
+	}
+
+	// Render
+	glColor3f (0.2, 0.2, 0.2);
+	DrawRect2D (x + 4, y + 4, w, h);
+
+	if (controller->uistate.hotitem == id 
+			|| controller->uistate.kbditem == id) {
+		if (controller->uistate.activeitem == id) {
+			glColor3f (0.8, 0.8, 0.8);
+			DrawRect2D (x, y, w, h);
+		} else {
+			glColor3f (0.7, 0.7, 0.7);
+			DrawRect2D (x, y, w, h);
+		}
+	} else {
+		glColor3f (0.4, 0.4, 0.4);
+		DrawRect2D (x, y, w, h);
+	}
+
+	// Rendering of the current value 
+	float width, height;
+	view = EngineGetView ();
+	assert (view);
+
+	glColor3f (1., 1., 1.);
+
+	std::string text_output = text_value;
+
+	if (controller->uistate.kbditem == id && SDL_GetTicks() >> 9 & 1)
+		text_output += "_";
+
+	view->DrawGLStringMeasure(text_value.c_str(), &width, &height);
+	view->DrawGLString(x + 16, y + 12, text_output.c_str());
+
+	// Keyboard Logic
+	if (controller->uistate.kbditem == id) {
+		switch (controller->uistate.last_keysym) {
+			case SDLK_DOWN:
+				controller->uistate.kbditem = 0;
+				controller->uistate.hotitem = 0;
+				controller->uistate.last_keysym = SDLK_CLEAR;
+				break;
+			case SDLK_UP:
+				controller->uistate.kbditem = controller->uistate.lastwidget;
+				controller->uistate.hotitem = controller->uistate.lastwidget;
+				controller->uistate.last_keysym = SDLK_CLEAR;
+			break;
+			case SDLK_CLEAR:
+				controller->uistate.last_keysym = SDLK_CLEAR;
+				controller->uistate.last_unicode = 0;
+				return false;
+				break;
+			case SDLK_ESCAPE:
+				controller->uistate.last_keysym = SDLK_CLEAR;
+				controller->uistate.last_unicode = 0;
+				controller->uistate.hotitem = 0;
+				controller->uistate.kbditem = 0;
+				return false;
+				break;
+			case SDLK_RETURN:
+				controller->uistate.last_keysym = SDLK_CLEAR;
+				controller->uistate.last_unicode = 0;
+				controller->uistate.hotitem = 0;
+				controller->uistate.kbditem = 0;
+				return true;
+				break;
+			case SDLK_BACKSPACE:
+				if (text_value.size() > 0) {
+					text_value = text_value.substr(0, text_value.size() - 1);
+					controller->uistate.last_keysym = SDLK_CLEAR;
+					controller->uistate.last_unicode = 0;
+					return true;
+				}
+				break;
+			default:
+				// The raw input processing
+				if (maxlength > 0 && text_value.size() < maxlength) {
+					if (controller->uistate.last_unicode) {	
+						if ((controller->uistate.last_unicode & 0xFF80) == 0) {
+							text_value += controller->uistate.last_unicode & 0x7F;
+							controller->uistate.last_unicode = 0;
+							return true;
+						} else {
+							LogWarning ("Input key not supported!");
+							return false;
+						}
+					}
+				}
+				break;
+
+		}
+	}
+
+	controller->uistate.lastwidget = id;
+
+	// Mouse Logic
+	if (controller->GetButtonState(MouseButtonLeft) == false
+			&& controller->uistate.hotitem == id
+			&& controller->uistate.activeitem == id) {
+		controller->uistate.kbditem = id;
+	}
 
 	return false;
 }

engine/IMGUIControls.h

@@ -1,6 +1,8 @@
 #ifndef _IMGUICONTROLS_H
 #define _IMGUICONTROLS_H
 
+#include <string>
+
 namespace Engine {
 
 namespace GUI {
@@ -20,6 +22,8 @@ void Label (int id, const char* caption, int x, int y);
  */
 bool Button (int id, const char* caption, int x, int y, int w, int h);
 
+bool LineEdit (int id, int x, int y, std::string &text_value, const int &maxlength);
+
 };
 
 };

engine/ModelBase.h

@@ -73,7 +73,7 @@ class ModelBase : public Module {
 		void SendEntityCollisionEvent (const unsigned int reference_entity_id,
 				const unsigned int incidence_entity_id, float collision_time, vector3d normal);
 
-		void SetGameState (const unsigned int &state) {
+		virtual void SetGameState (const unsigned int &state) {
 			mLastGameState = mGameState;
 			mGameState = state;
 		};

engine/ViewBase.cc

@@ -146,7 +146,7 @@ void ViewBase::UpdateCamera () {
 	mCamera->Update ();
 }
 
-void ViewBase::Draw () {
+void ViewBase::PreDraw() {
 	// Clear the screen
 	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 
@@ -166,7 +166,13 @@ void ViewBase::Draw () {
 		last_fps_update = 0;
 		frame_counter = 0;
 	}
-	
+}
+
+void ViewBase::Draw () {
+	// Perform pre-Draw actions
+	PreDraw ();
+
+	// Actual Drawing
 	UpdateCamera ();
 
 	if (mDrawGrid)
@@ -179,7 +185,11 @@ void ViewBase::Draw () {
 
 	mOverlayManager.Draw();
 
-	// and update the screen
+	// Perform post-Draw actions
+	PostDraw();
+}
+
+void ViewBase::PostDraw() {
 	SDL_GL_SwapBuffers ();
 }
 

engine/ViewBase.h

@@ -27,6 +27,11 @@ class ViewBase : public Module{
 		/** \brief Resizes the View */
 		void Resize (int width, int height);
 
+		/** \brief Performs actions before drawing (e.g. timer stuff) */
+		void PreDraw();
+		/** \brief Performs actions after drawing (e.g. swapping of buffers, etc.) */
+		void PostDraw();
+
 		/** \brief Performs all drawing */
 		virtual void Draw ();