Initial commit

gui/widgets/scrollbar.h

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+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#ifndef GUI_WIDGETS_SCROLLBAR_H
+#define GUI_WIDGETS_SCROLLBAR_H
+
+#include "gui/widget.h"
+
+namespace GUI {
+
+enum {
+	kSetPositionCmd		= 'SETP'
+};
+
+
+class ScrollBarWidget : public Widget, public CommandSender {
+protected:
+	typedef enum {
+		kNoPart,
+		kUpArrowPart,
+		kDownArrowPart,
+		kSliderPart,
+		kPageUpPart,
+		kPageDownPart
+	} Part;
+
+	Part	_part;
+	int		_sliderHeight;
+	int		_sliderPos;
+
+	Part	_draggingPart;
+	int		_sliderDeltaMouseDownPos;
+
+	enum {
+		kRepeatInitialDelay = 500,
+		kRepeatDelay = 100
+	};
+	uint32	_repeatTimer;
+
+public:
+	int		_numEntries;
+	int		_entriesPerPage;
+	int		_currentPos;
+	int		_singleStep;
+
+public:
+	ScrollBarWidget(GuiObject *boss, int x, int y, int w, int h);
+
+	void handleMouseDown(int x, int y, int button, int clickCount) override;
+	void handleMouseUp(int x, int y, int button, int clickCount) override;
+	void handleMouseWheel(int x, int y, int direction) override;
+	void handleMouseMoved(int x, int y, int button) override;
+	void handleMouseEntered(int button) override	{ setFlags(WIDGET_HILITED); }
+	void handleMouseLeft(int button) override	{ clearFlags(WIDGET_HILITED); _part = kNoPart; markAsDirty(); }
+	void handleTickle() override;
+	bool wantsFocus() override { return true; }
+
+	// FIXME - this should be private, but then we also have to add accessors
+	// for _numEntries, _entriesPerPage and _currentPos. This again leads to the question:
+	// should these accessors force a redraw?
+	void recalc();
+
+	void checkBounds(int old_pos);
+
+protected:
+	void drawWidget() override;
+};
+
+} // End of namespace GUI
+
+#endif