/**
* CustomButtonField.java
*
* Copyright � 1998-2011 Research In Motion Limited
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* Note: For the sake of simplicity, this sample application may not leverage
* resource bundles and resource strings. However, it is STRONGLY recommended
* that application developers make use of the localization features available
* within the BlackBerry development platform to ensure a seamless application
* experience across a variety of languages and geographies. For more information
* on localizing your application, please refer to the BlackBerry Java Development
* Environment Development Guide associated with this release.
*/
package com.rim.samples.device.ui.custombuttonsdemo;
import net.rim.device.api.system.Display;
import net.rim.device.api.ui.Color;
import net.rim.device.api.ui.DrawStyle;
import net.rim.device.api.ui.Field;
import net.rim.device.api.ui.Font;
import net.rim.device.api.ui.Graphics;
/**
* CustomButtonField - class which creates button fields of various shapes.
* Demonstrates how to create custom ui fields.
*/
public class CustomButtonField extends Field implements DrawStyle {
static final int RECTANGLE = 1;
static final int TRIANGLE = 2;
static final int OCTAGON = 3;
static final int FIXED_WIDTH = 4;
static final int FULLSCREEN = 5;
static final int COLOUR_BACKGROUND = 6;
private final String _label;
private final int _shape;
private Font _font;
private int _labelHeight;
private int _labelWidth;
/**
* Constructs a button with specified label, and default style and shape.
*/
public CustomButtonField(final String label) {
this(label, RECTANGLE, 0);
}
/**
* Constructs a button with specified label and shape, and default style.
*/
public CustomButtonField(final String label, final int shape) {
this(label, shape, 0);
}
/**
* Constructs a button with specified label and style, and default shape.
*/
public CustomButtonField(final String label, final long style) {
this(label, RECTANGLE, style);
}
/**
* Constructs a button with specified label, shape, and style.
*/
public CustomButtonField(final String label, final int shape,
final long style) {
super(style);
_label = label;
_shape = shape;
_font = getFont();
_labelHeight = _font.getHeight();
_labelWidth = _font.getAdvance(_label);
}
/**
* @return The text on the button
*/
String getText() {
return _label;
}
/**
* Field implementation.
*
* @see net.rim.device.api.ui.Field#getPreferredWidth()
*/
public int getPreferredWidth() {
switch (_shape) {
case TRIANGLE:
if (_labelWidth < _labelHeight) {
return _labelHeight << 2;
} else {
return _labelWidth << 1;
}
case OCTAGON:
if (_labelWidth < _labelHeight) {
return _labelHeight + 4;
} else {
return _labelWidth + 8;
}
case FIXED_WIDTH:
return _font.getAdvance(" ") * 35; // Always set to 35 spaces wide
case FULLSCREEN:
return Display.getWidth();
default:
return _labelWidth + 8;
}
}
/**
* Field implementation.
*
* @see net.rim.device.api.ui.Field#getPreferredHeight()
*/
public int getPreferredHeight() {
switch (_shape) {
case TRIANGLE:
if (_labelWidth < _labelHeight) {
return _labelHeight << 1;
} else {
return _labelWidth;
}
case OCTAGON:
return getPreferredWidth();
default:
return _labelHeight + 4;
}
}
/**
* Field implementation.
*
* @see net.rim.device.api.ui.Field#drawFocus(Graphics, boolean)
*/
protected void drawFocus(final Graphics graphics, final boolean on) {
switch (_shape) {
case TRIANGLE:
final int w = getWidth();
final int h = w >> 1;
for (int i = h - 1; i >= 2; --i) {
graphics.invert(i, h - i, w - (i << 1), 1);
}
break;
case OCTAGON:
int x3 = getWidth();
final int x = 5 * x3 / 17;
int x2 = x3 - x;
x3 = x3 - 1;
x2 = x2 - 1;
graphics.invert(1, x, getWidth() - 2, x2 - x + 1);
for (int i = 1; i < x; ++i) {
graphics.invert(1 + i, x - i, getWidth() - (i + 1 << 1), 1);
graphics.invert(1 + i, x2 + i, getWidth() - (i + 1 << 1), 1);
}
break;
default:
graphics.invert(1, 1, getWidth() - 2, getHeight() - 2);
break;
}
}
/**
* Field implementation.
*
* @see net.rim.device.api.ui.Field#layout(int, int)
*/
protected void layout(int width, int height) {
// Update the cached font - in case it has been changed.
_font = getFont();
_labelHeight = _font.getHeight();
_labelWidth = _font.getAdvance(_label);
// Calc width.
width = Math.min(width, getPreferredWidth());
// Calc height.
height = Math.min(height, getPreferredHeight());
// Set dimensions.
setExtent(width, height);
}
/**
* Field implementation.
*
* @see net.rim.device.api.ui.Field#paint(Graphics)
*/
protected void paint(final Graphics graphics) {
int textX, textY, textWidth;
final int w = getWidth();
int h = getHeight();
switch (_shape) {
case TRIANGLE:
h = w >> 1;
final int m = (w >> 1) - 1;
graphics.drawLine(0, h - 1, m, 0);
graphics.drawLine(m, 0, w - 1, h - 1);
graphics.drawLine(0, h - 1, w - 1, h - 1);
textWidth = Math.min(_labelWidth, h);
textX = w - textWidth >> 1;
textY = h >> 1;
break;
case OCTAGON:
final int x = 5 * w / 17;
final int x2 = w - x - 1;
final int x3 = w - 1;
graphics.drawLine(0, x, 0, x2);
graphics.drawLine(x3, x, x3, x2);
graphics.drawLine(x, 0, x2, 0);
graphics.drawLine(x, x3, x2, x3);
graphics.drawLine(0, x, x, 0);
graphics.drawLine(0, x2, x, x3);
graphics.drawLine(x2, 0, x3, x);
graphics.drawLine(x2, x3, x3, x2);
textWidth = Math.min(_labelWidth, w - 6);
textX = w - textWidth >> 1;
textY = w - _labelHeight >> 1;
break;
case COLOUR_BACKGROUND:
graphics.setColor(Color.LIGHTBLUE);
graphics.fillRect(0, 0, w, h);
graphics.setColor(Color.BLACK);
textX = 4;
textY = 2;
textWidth = w - 6;
break;
default:
graphics.drawRect(0, 0, w, h);
textX = 4;
textY = 2;
textWidth = w - 6;
break;
}
graphics.drawText(_label, textX, textY, (int) (getStyle()
& DrawStyle.ELLIPSIS | DrawStyle.HALIGN_MASK), textWidth);
}
/**
* Overridden so that the Event Dispatch thread can catch this event instead
* of having it be caught here.
*
* @see net.rim.device.api.ui.Field#navigationClick(int, int)
*/
protected boolean navigationClick(final int status, final int time) {
fieldChangeNotify(0);
return true;
}
}