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/*
* Copyright (c) 2012, Codename One and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Codename One designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code 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
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Codename One through http://www.codenameone.com/ if you
* need additional information or have any questions.
*/
package com.codename1.ui.spinner;
import com.codename1.ui.Component;
import com.codename1.ui.Font;
import com.codename1.ui.Graphics;
import com.codename1.ui.Image;
import com.codename1.ui.ImageFactory;
import com.codename1.ui.List;
import com.codename1.ui.list.DefaultListCellRenderer;
import com.codename1.ui.plaf.Style;
import com.codename1.ui.plaf.UIManager;
import com.codename1.ui.util.Effects;
import java.util.HashMap;
import java.util.Map;
/**
* Spinner renderer that can automatically simulate the iOS perspective transform behavior
*
* @author Shai Almog
*/
class SpinnerRenderer extends DefaultListCellRenderer{
private Map[] imageCache;
private static final int PERSPECTIVES = 9;
private static final int FRONT_ANGLE = 4;
private static final float[] TOP_SCALE = {0.5f, 0.5f, 0.8f, 0.95f, 1.0f, 1.0f, 1.0f, 1.0f, 1.0f};
private static final float[] BOTTOM_SCALE = {1.0f, 1.0f, 1.0f, 1.0f, 1.0f, 0.95f, 0.8f, 0.5f, 0.5f};
private static final float[] VERTICAL_SHRINK = {0.5f, 0.5f, 0.80f, 0.90f, 1.0f, 0.90f, 0.80f, 0.5f, 0.5f};
int perspective;
public SpinnerRenderer() {
super(false);
}
@Override
public Component getCellRendererComponent(Component list, Object model, T value, int index, boolean isSelected) {
if(iOS7Mode) {
perspective = -1;
// calculate perspective
int idx = ((List)list).getCurrentSelected();
if(idx == index) {
perspective = FRONT_ANGLE;
} else {
int count = ((List)list).getModel().getSize();
int directDistance = Math.abs(idx - index);
int indirect;
if(index > idx) {
indirect = count - index + idx;
} else {
indirect = count - idx + index;
}
if(indirect < directDistance) {
if(indirect < FRONT_ANGLE) {
if(index < idx) {
perspective = indirect;
} else {
perspective = FRONT_ANGLE + 1 + indirect;
}
}
} else {
if(directDistance < FRONT_ANGLE) {
if(index < idx) {
perspective = directDistance;
} else {
perspective = FRONT_ANGLE + 1 + directDistance;
}
}
}
}
}
return super.getCellRendererComponent(list, model, value, index, isSelected);
}
static boolean iOS7Mode;
@Override
public void paint(Graphics g) {
if(!iOS7Mode || perspective == FRONT_ANGLE) {
super.paint(g);
} else {
if(!isInClippingRegion(g)) {
return;
}
Style s = getStyle();
drawStringPerspectivePosition(g, getText(), getX() + s.getPaddingLeftNoRTL(), getY() + s.getPaddingTop());
}
}
/**
* Draws the character with the given perspective effect
*/
private int drawCharPerspectivePosition(Graphics g, char c, int x, int y) {
if(imageCache == null) {
imageCache = new HashMap[PERSPECTIVES];
for(int iter = 0 ; iter < PERSPECTIVES ; iter++) {
if(iter != FRONT_ANGLE) {
imageCache[iter] = new HashMap();
}
}
}
Character chr = new Character(c);
Image i = imageCache[perspective].get(chr);
if(i == null) {
//UIManager.getInstance().getLookAndFeel().setFG(g, this);
Font f = getStyle().getFont();
int w = f.charWidth(c);
int h = f.getHeight();
i = ImageFactory.createImage(this, w, h, 0);
g = i.getGraphics();
UIManager.getInstance().getLookAndFeel().setFG(g, this);
int alpha = g.concatenateAlpha(getStyle().getFgAlpha());
g.drawChar(c, 0, 0);
g.setAlpha(alpha);
i = Effects.verticalPerspective(i, TOP_SCALE[perspective], BOTTOM_SCALE[perspective], VERTICAL_SHRINK[perspective]);
imageCache[perspective].put(chr, i);
}
g.drawImage(i, x, y);
return i.getWidth();
}
private void drawStringPerspectivePosition(Graphics g, String s, int x, int y) {
if(perspective < 0 || perspective >= PERSPECTIVES) {
return;
}
int l = s.length();
int position = 0;
for(int iter = 0 ; iter < l ; iter++) {
char c = s.charAt(iter);
position += drawCharPerspectivePosition(g, c, x + position, y);
position -= 4;
}
}
}
