v0.3.1: added a slider for selecting multi-value options

src/com/shatteredpixel/shatteredpixeldungeon/ui/OptionSlider.java

@@ -0,0 +1,163 @@
+/*
+ * Pixel Dungeon
+ * Copyright (C) 2012-2015  Oleg Dolya
+ *
+ * Shattered Pixel Dungeon
+ * Copyright (C) 2014-2015 Evan Debenham
+ *
+ * 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/>
+ */
+package com.shatteredpixel.shatteredpixeldungeon.ui;
+
+import com.shatteredpixel.shatteredpixeldungeon.Chrome;
+import com.shatteredpixel.shatteredpixeldungeon.scenes.PixelScene;
+import com.watabou.input.Touchscreen;
+import com.watabou.noosa.*;
+import com.watabou.noosa.ui.Component;
+import com.watabou.utils.Callback;
+import com.watabou.utils.GameMath;
+import com.watabou.utils.Point;
+import com.watabou.utils.PointF;
+
+public abstract class OptionSlider extends Component {
+
+	private TouchArea touchArea;
+
+	private BitmapText title;
+	private BitmapText minTxt;
+	private BitmapText maxTxt;
+
+	//values are expressed internally as ints, but they can easily be interpreted as something else externally.
+	private int minVal;
+	private int maxVal;
+	private int selectedVal;
+
+	private NinePatch sliderNode;
+	private NinePatch BG;
+	private ColorBlock sliderBG;
+	private ColorBlock[] sliderTicks;
+	private float tickDist;
+
+
+	public OptionSlider(String title, String minTxt, String maxTxt, int minVal, int maxVal){
+		super();
+
+		this.title.text(title);
+		this.title.measure();
+		this.minTxt.text(minTxt);
+		this.minTxt.measure();
+		this.maxTxt.text(maxTxt);
+		this.maxTxt.measure();
+
+		this.minVal = minVal;
+		this.maxVal = maxVal;
+
+		if (minVal > maxVal) throw new IllegalArgumentException();
+
+		sliderTicks = new ColorBlock[(maxVal - minVal) + 1];
+		for (int i = 0; i < sliderTicks.length; i++){
+			add(sliderTicks[i] = new ColorBlock(1, 11, 0xFF222222));
+		}
+		add(sliderNode);
+	}
+
+	protected abstract void onChange();
+
+	public int getSelectedValue(){
+		return selectedVal;
+	}
+
+	public void setSelectedValue(int val) {
+		this.selectedVal = val;
+		sliderNode.x = (int)(x + tickDist*(selectedVal-minVal));
+		sliderNode.y = sliderBG.y-4;
+	}
+
+	@Override
+	protected void createChildren() {
+		super.createChildren();
+
+		add( BG = Chrome.get(Chrome.Type.BUTTON));
+		BG.alpha(0.5f);
+
+		add(title = PixelScene.createText(9));
+		add(this.minTxt = PixelScene.createText(6));
+		add(this.maxTxt = PixelScene.createText(6));
+
+		add(sliderBG = new ColorBlock(1, 1, 0xFF222222));
+		sliderNode = Chrome.get(Chrome.Type.BUTTON);
+		sliderNode.size(5, 9);
+
+		touchArea = new TouchArea(0, 0, 0, 0){
+			@Override
+			protected void onTouchDown(Touchscreen.Touch touch) {
+				PointF p = camera().screenToCamera((int) touch.current.x, (int) touch.current.y);
+				sliderNode.x = GameMath.gate(sliderBG.x-2, p.x, sliderBG.x+sliderBG.width()-2);
+				sliderNode.brightness(1.5f);
+			}
+
+			@Override
+			protected void onDrag(Touchscreen.Touch touch) {
+				PointF p = camera().screenToCamera((int) touch.current.x, (int) touch.current.y);
+				sliderNode.x = GameMath.gate(sliderBG.x-2, p.x, sliderBG.x+sliderBG.width()-2);
+			}
+
+			@Override
+			protected void onTouchUp(Touchscreen.Touch touch) {
+				PointF p = camera().screenToCamera((int) touch.current.x, (int) touch.current.y);
+				sliderNode.x = GameMath.gate(sliderBG.x-2, p.x, sliderBG.x+sliderBG.width()-2);
+				sliderNode.resetColor();
+
+				//sets the selected value
+				selectedVal = minVal + Math.round(sliderNode.x/tickDist);
+				sliderNode.x = (int)(x + tickDist*(selectedVal-minVal));
+				onChange();
+			}
+		};
+		add(touchArea);
+
+	}
+
+	@Override
+	protected void layout() {
+		title.x = x + (width-title.width())/2;
+		title.y = y+2;
+		sliderBG.y = y + height() - 8;
+		sliderBG.x = x+2;
+		sliderBG.size(width-5, 1);
+		tickDist = sliderBG.width()/(maxVal - minVal);
+		for (int i = 0; i < sliderTicks.length; i++){
+			sliderTicks[i].y = sliderBG.y-5;
+			sliderTicks[i].x = (int)(x + 2 + (tickDist*i));
+		}
+
+		minTxt.y = maxTxt.y = sliderBG.y-6-minTxt.baseLine();
+		minTxt.x = x+1;
+		maxTxt.x = x+width()-maxTxt.width()-1;
+
+
+		sliderNode.x = (int)(x + tickDist*(selectedVal-minVal));
+		sliderNode.y = sliderBG.y-4;
+
+		touchArea.x = x;
+		touchArea.y = y;
+		touchArea.width = width();
+		touchArea.height = height();
+
+		BG.size(width(), height());
+		BG.x = x;
+		BG.y = y;
+
+	}
+}