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/*
* Jexer - Java Text User Interface
*
* The MIT License (MIT)
*
* Copyright (C) 2019 Kevin Lamonte
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*
* @author Kevin Lamonte [[email protected]]
* @version 1
*/
package jexer;
import jexer.bits.CellAttributes;
import jexer.bits.Color;
import jexer.bits.GraphicsChars;
import jexer.bits.MnemonicString;
import jexer.event.TKeypressEvent;
import jexer.event.TMouseEvent;
import static jexer.TKeypress.kbEnter;
import static jexer.TKeypress.kbSpace;
/**
* TButton implements a simple button. To make the button do something, pass
* a TAction class to its constructor.
*
* @see TAction#DO()
*/
public class TButton extends TWidget {
// ------------------------------------------------------------------------
// Variables --------------------------------------------------------------
// ------------------------------------------------------------------------
/**
* The shortcut and button text.
*/
private MnemonicString mnemonic;
/**
* Remember mouse state.
*/
private TMouseEvent mouse;
/**
* True when the button is being pressed and held down.
*/
private boolean inButtonPress = false;
/**
* The action to perform when the button is clicked.
*/
private TAction action;
/**
* The background color used for the button "shadow", or null for "no
* shadow".
*/
private CellAttributes shadowColor;
// ------------------------------------------------------------------------
// Constructors -----------------------------------------------------------
// ------------------------------------------------------------------------
/**
* Private constructor.
*
* @param parent parent widget
* @param text label on the button
* @param x column relative to parent
* @param y row relative to parent
*/
private TButton(final TWidget parent, final String text,
final int x, final int y) {
// Set parent and window
super(parent);
mnemonic = new MnemonicString(text);
setX(x);
setY(y);
setHeight(2);
setWidth(mnemonic.getRawLabel().length() + 3);
shadowColor = new CellAttributes();
shadowColor.setTo(getWindow().getBackground());
shadowColor.setForeColor(Color.BLACK);
shadowColor.setBold(false);
}
/**
* Public constructor.
*
* @param parent parent widget
* @param text label on the button
* @param x column relative to parent
* @param y row relative to parent
* @param action to call when button is pressed
*/
public TButton(final TWidget parent, final String text,
final int x, final int y, final TAction action) {
this(parent, text, x, y);
this.action = action;
}
// ------------------------------------------------------------------------
// Event handlers ---------------------------------------------------------
// ------------------------------------------------------------------------
/**
* Returns true if the mouse is currently on the button.
*
* @return if true the mouse is currently on the button
*/
private boolean mouseOnButton() {
int rightEdge = getWidth() - 1;
if (inButtonPress) {
rightEdge++;
}
if ((mouse != null)
&& (mouse.getY() == 0)
&& (mouse.getX() >= 0)
&& (mouse.getX() < rightEdge)
) {
return true;
}
return false;
}
/**
* Handle mouse button presses.
*
* @param mouse mouse button event
*/
@Override
public void onMouseDown(final TMouseEvent mouse) {
this.mouse = mouse;
if ((mouseOnButton()) && (mouse.isMouse1())) {
// Begin button press
inButtonPress = true;
}
}
/**
* Handle mouse button releases.
*
* @param mouse mouse button release event
*/
@Override
public void onMouseUp(final TMouseEvent mouse) {
this.mouse = mouse;
if (inButtonPress && mouse.isMouse1()) {
// Dispatch the event
dispatch();
}
}
/**
* Handle mouse movements.
*
* @param mouse mouse motion event
*/
@Override
public void onMouseMotion(final TMouseEvent mouse) {
this.mouse = mouse;
if (!mouseOnButton()) {
inButtonPress = false;
}
}
/**
* Handle keystrokes.
*
* @param keypress keystroke event
*/
@Override
public void onKeypress(final TKeypressEvent keypress) {
if (keypress.equals(kbEnter)
|| keypress.equals(kbSpace)
) {
// Dispatch
dispatch();
return;
}
// Pass to parent for the things we don't care about.
super.onKeypress(keypress);
}
// ------------------------------------------------------------------------
// TWidget ----------------------------------------------------------------
// ------------------------------------------------------------------------
/**
* Draw a button with a shadow.
*/
@Override
public void draw() {
CellAttributes buttonColor;
CellAttributes menuMnemonicColor;
if (!isEnabled()) {
buttonColor = getTheme().getColor("tbutton.disabled");
menuMnemonicColor = getTheme().getColor("tbutton.disabled");
} else if (isAbsoluteActive()) {
buttonColor = getTheme().getColor("tbutton.active");
menuMnemonicColor = getTheme().getColor("tbutton.mnemonic.highlighted");
} else {
buttonColor = getTheme().getColor("tbutton.inactive");
menuMnemonicColor = getTheme().getColor("tbutton.mnemonic");
}
if (inButtonPress) {
putCharXY(1, 0, ' ', buttonColor);
putStringXY(2, 0, mnemonic.getRawLabel(), buttonColor);
putCharXY(getWidth() - 1, 0, ' ', buttonColor);
} else {
putCharXY(0, 0, ' ', buttonColor);
putStringXY(1, 0, mnemonic.getRawLabel(), buttonColor);
putCharXY(getWidth() - 2, 0, ' ', buttonColor);
if (shadowColor != null) {
putCharXY(getWidth() - 1, 0,
GraphicsChars.CP437[0xDC], shadowColor);
hLineXY(1, 1, getWidth() - 1,
GraphicsChars.CP437[0xDF], shadowColor);
}
}
if (mnemonic.getShortcutIdx() >= 0) {
if (inButtonPress) {
putCharXY(2 + mnemonic.getShortcutIdx(), 0,
mnemonic.getShortcut(), menuMnemonicColor);
} else {
putCharXY(1 + mnemonic.getShortcutIdx(), 0,
mnemonic.getShortcut(), menuMnemonicColor);
}
}
}
// ------------------------------------------------------------------------
// TButton ----------------------------------------------------------------
// ------------------------------------------------------------------------
/**
* Get the mnemonic string for this button.
*
* @return mnemonic string
*/
public MnemonicString getMnemonic() {
return mnemonic;
}
/**
* Act as though the button was pressed. This is useful for other UI
* elements to get the same action as if the user clicked the button.
*/
public void dispatch() {
if (action != null) {
action.DO();
inButtonPress = false;
}
}
/**
* Set the background color used for the button "shadow". If null, no
* shadow will be drawn.
*
* @param color the new background color, or null for no shadow
*/
public void setShadowColor(final CellAttributes color) {
if (color != null) {
shadowColor = new CellAttributes();
shadowColor.setTo(color);
shadowColor.setForeColor(Color.BLACK);
shadowColor.setBold(false);
} else {
shadowColor = null;
}
}
}
