Split UI code into application/plugin UI and UI library.

1 files changed, 297 insertions, 0 deletions

diff --git a/dggui/eventhandler.cc b/dggui/eventhandler.cc
new file mode 100644
index 0000000..fd333b8
--- /dev/null
+++ b/dggui/eventhandler.cc
@@ -0,0 +1,297 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/***************************************************************************
+ *            eventhandler.cc
+ *
+ *  Sun Oct  9 18:58:29 CEST 2011
+ *  Copyright 2011 Bent Bisballe Nyeng
+ *  deva@aasimon.org
+ ****************************************************************************/
+
+/*
+ *  This file is part of DrumGizmo.
+ *
+ *  DrumGizmo is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU Lesser General Public License as published by
+ *  the Free Software Foundation; either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  DrumGizmo is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public License
+ *  along with DrumGizmo; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA.
+ */
+#include "eventhandler.h"
+
+#include "window.h"
+#include "painter.h"
+#include "dialog.h"
+
+namespace GUI
+{
+
+EventHandler::EventHandler(NativeWindow& nativeWindow, Window& window)
+	: window(window)
+	, nativeWindow(nativeWindow)
+	, lastWasDoubleClick(false)
+{}
+
+bool EventHandler::hasEvent()
+{
+	return !events.empty();
+}
+
+bool EventHandler::queryNextEventType(EventType type)
+{
+	return !events.empty() &&
+		(events.front()->type() == type);
+}
+
+std::shared_ptr<Event> EventHandler::getNextEvent()
+{
+	if(events.empty())
+	{
+		return nullptr;
+	}
+
+	auto event = events.front();
+	events.pop_front();
+	return event;
+}
+
+void EventHandler::processEvents()
+{
+	bool block_interaction{false};
+	for(auto dialog : dialogs)
+	{
+		// Check if the dialog nativewindow (not the contained widget) is visible
+		if(dialog->native->visible())
+		{
+			block_interaction |= dialog->isModal();
+			dialog->eventHandler()->processEvents();
+		}
+	}
+
+	events = nativeWindow.getEvents();
+
+	while(hasEvent())
+	{
+		auto event = getNextEvent();
+
+		if(event == nullptr)
+		{
+			continue;
+		}
+
+		switch(event->type()) {
+		case EventType::repaint:
+			break;
+
+		case EventType::move:
+			{
+				auto moveEvent = static_cast<MoveEvent*>(event.get());
+				window.moved(moveEvent->x, moveEvent->y);
+			}
+			break;
+
+		case EventType::resize:
+			{
+				auto resizeEvent = static_cast<ResizeEvent*>(event.get());
+				if((resizeEvent->width != window.width()) ||
+				   (resizeEvent->height != window.height()))
+				{
+					window.resized(resizeEvent->width, resizeEvent->height);
+				}
+			}
+			break;
+
+		case EventType::mouseMove:
+			{
+				// Skip all consecutive mouse move events and handle only the last one.
+				while(queryNextEventType(EventType::mouseMove))
+				{
+					event = getNextEvent();
+				}
+
+				auto moveEvent = static_cast<MouseMoveEvent*>(event.get());
+
+				auto widget = window.find(moveEvent->x, moveEvent->y);
+				auto oldwidget = window.mouseFocus();
+				if(widget != oldwidget)
+				{
+					// Send focus leave to oldwidget
+					if(oldwidget)
+					{
+						oldwidget->mouseLeaveEvent();
+					}
+
+					// Send focus enter to widget
+					if(widget)
+					{
+						widget->mouseEnterEvent();
+					}
+
+					window.setMouseFocus(widget);
+				}
+
+				if(window.buttonDownFocus())
+				{
+					auto widget = window.buttonDownFocus();
+					moveEvent->x -= widget->translateToWindowX();
+					moveEvent->y -= widget->translateToWindowY();
+
+					window.buttonDownFocus()->mouseMoveEvent(moveEvent);
+					break;
+				}
+
+				if(widget)
+				{
+					moveEvent->x -= widget->translateToWindowX();
+					moveEvent->y -= widget->translateToWindowY();
+					widget->mouseMoveEvent(moveEvent);
+				}
+			}
+			break;
+
+		case EventType::button:
+			{
+				if(block_interaction)
+				{
+					continue;
+				}
+
+				auto buttonEvent = static_cast<ButtonEvent*>(event.get());
+				if(lastWasDoubleClick && (buttonEvent->direction == Direction::down))
+				{
+					lastWasDoubleClick = false;
+					continue;
+				}
+
+				lastWasDoubleClick = buttonEvent->doubleClick;
+
+				auto widget = window.find(buttonEvent->x, buttonEvent->y);
+
+				if(window.buttonDownFocus())
+				{
+					if(buttonEvent->direction == Direction::up)
+					{
+						auto widget = window.buttonDownFocus();
+						buttonEvent->x -= widget->translateToWindowX();
+						buttonEvent->y -= widget->translateToWindowY();
+
+						widget->buttonEvent(buttonEvent);
+						window.setButtonDownFocus(nullptr);
+						break;
+					}
+				}
+
+				if(widget)
+				{
+					buttonEvent->x -= widget->translateToWindowX();
+					buttonEvent->y -= widget->translateToWindowY();
+
+					widget->buttonEvent(buttonEvent);
+
+					if((buttonEvent->direction == Direction::down) &&
+					   widget->catchMouse())
+					{
+						window.setButtonDownFocus(widget);
+					}
+
+					if(widget->isFocusable())
+					{
+						window.setKeyboardFocus(widget);
+					}
+				}
+			}
+			break;
+
+		case EventType::scroll:
+			{
+				if(block_interaction)
+				{
+					continue;
+				}
+
+				auto scrollEvent = static_cast<ScrollEvent*>(event.get());
+
+				auto widget = window.find(scrollEvent->x, scrollEvent->y);
+				if(widget)
+				{
+					scrollEvent->x -= widget->translateToWindowX();
+					scrollEvent->y -= widget->translateToWindowY();
+
+					widget->scrollEvent(scrollEvent);
+				}
+			}
+			break;
+
+		case EventType::key:
+			{
+				if(block_interaction)
+				{
+					continue;
+				}
+
+				// TODO: Filter out multiple arrow events.
+
+				auto keyEvent = static_cast<KeyEvent*>(event.get());
+				if(window.keyboardFocus())
+				{
+					window.keyboardFocus()->keyEvent(keyEvent);
+				}
+			}
+			break;
+
+		case EventType::close:
+			if(block_interaction)
+			{
+				continue;
+			}
+
+			closeNotifier();
+			break;
+
+		case EventType::mouseEnter:
+			{
+				auto enterEvent = static_cast<MouseEnterEvent*>(event.get());
+				auto widget = window.find(enterEvent->x, enterEvent->y);
+				if(widget)
+				{
+					widget->mouseEnterEvent();
+				}
+			}
+			break;
+
+		case EventType::mouseLeave:
+			{
+				auto widget = window.mouseFocus();
+				if(widget)
+				{
+					widget->mouseLeaveEvent();
+				}
+			}
+			break;
+		}
+	}
+
+	// Probe window and children to redraw as needed.
+	// NOTE: This method will invoke native->redraw() if a redraw is needed.
+	window.updateBuffer();
+}
+
+void EventHandler::registerDialog(Dialog* dialog)
+{
+	dialogs.push_back(dialog);
+}
+
+void EventHandler::unregisterDialog(Dialog* dialog)
+{
+	dialogs.remove(dialog);
+}
+
+
+} // GUI::