+++ /dev/null
-/*
- * Jexer - Java Text User Interface
- *
- * License: LGPLv3 or later
- *
- * This module is licensed under the GNU Lesser General Public License
- * Version 3. Please see the file "COPYING" in this directory for more
- * information about the GNU Lesser General Public License Version 3.
- *
- * Copyright (C) 2015 Kevin Lamonte
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser 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 Lesser General Public
- * License along with this program; if not, see
- * http://www.gnu.org/licenses/, or write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
- * 02110-1301 USA
- *
- * @author Kevin Lamonte [kevin.lamonte@gmail.com]
- * @version 1
- */
-package jexer;
-
-import jexer.bits.CellAttributes;
-import jexer.bits.GraphicsChars;
-import jexer.event.TMouseEvent;
-
-/**
- * TVScroller implements a simple vertical scroll bar.
- */
-public final class TVScroller extends TWidget {
-
- /**
- * Value that corresponds to being on the top edge of the scroll bar.
- */
- private int topValue = 0;
-
- /**
- * Get the value that corresponds to being on the top edge of the scroll
- * bar.
- *
- * @return the scroll value
- */
- public int getTopValue() {
- return topValue;
- }
-
- /**
- * Set the value that corresponds to being on the top edge of the scroll
- * bar.
- *
- * @param topValue the new scroll value
- */
- public void setTopValue(final int topValue) {
- this.topValue = topValue;
- }
-
- /**
- * Value that corresponds to being on the bottom edge of the scroll bar.
- */
- private int bottomValue = 100;
-
- /**
- * Get the value that corresponds to being on the bottom edge of the
- * scroll bar.
- *
- * @return the scroll value
- */
- public int getBottomValue() {
- return bottomValue;
- }
-
- /**
- * Set the value that corresponds to being on the bottom edge of the
- * scroll bar.
- *
- * @param bottomValue the new scroll value
- */
- public void setBottomValue(final int bottomValue) {
- this.bottomValue = bottomValue;
- }
-
- /**
- * Current value of the scroll.
- */
- private int value = 0;
-
- /**
- * Get current value of the scroll.
- *
- * @return the scroll value
- */
- public int getValue() {
- return value;
- }
-
- /**
- * Set current value of the scroll.
- *
- * @param value the new scroll value
- */
- public void setValue(final int value) {
- this.value = value;
- }
-
- /**
- * The increment for clicking on an arrow.
- */
- private int smallChange = 1;
-
- /**
- * Set the increment for clicking on an arrow.
- *
- * @param smallChange the new increment value
- */
- public void setSmallChange(final int smallChange) {
- this.smallChange = smallChange;
- }
-
- /**
- * The increment for clicking in the bar between the box and an arrow.
- */
- private int bigChange = 20;
-
- /**
- * Set the increment for clicking in the bar between the box and an
- * arrow.
- *
- * @param bigChange the new increment value
- */
- public void setBigChange(final int bigChange) {
- this.bigChange = bigChange;
- }
-
- /**
- * When true, the user is dragging the scroll box.
- */
- private boolean inScroll = false;
-
- /**
- * Public constructor.
- *
- * @param parent parent widget
- * @param x column relative to parent
- * @param y row relative to parent
- * @param height height of scroll bar
- */
- public TVScroller(final TWidget parent, final int x, final int y,
- final int height) {
-
- // Set parent and window
- super(parent, x, y, 1, height);
- }
-
- /**
- * Compute the position of the scroll box (a.k.a. grip, thumb).
- *
- * @return Y position of the box, between 1 and height - 2
- */
- private int boxPosition() {
- return (getHeight() - 3) * (value - topValue) / (bottomValue - topValue) + 1;
- }
-
- /**
- * Draw a vertical scroll bar.
- */
- @Override
- public void draw() {
- CellAttributes arrowColor = getTheme().getColor("tscroller.arrows");
- CellAttributes barColor = getTheme().getColor("tscroller.bar");
- getScreen().putCharXY(0, 0, GraphicsChars.CP437[0x1E], arrowColor);
- getScreen().putCharXY(0, getHeight() - 1, GraphicsChars.CP437[0x1F],
- arrowColor);
-
- // Place the box
- if (bottomValue > topValue) {
- getScreen().vLineXY(0, 1, getHeight() - 2,
- GraphicsChars.CP437[0xB1], barColor);
- getScreen().putCharXY(0, boxPosition(), GraphicsChars.BOX,
- arrowColor);
- } else {
- getScreen().vLineXY(0, 1, getHeight() - 2, GraphicsChars.HATCH,
- barColor);
- }
-
- }
-
- /**
- * Perform a small step change up.
- */
- public void decrement() {
- if (bottomValue == topValue) {
- return;
- }
- value -= smallChange;
- if (value < topValue) {
- value = topValue;
- }
- }
-
- /**
- * Perform a small step change down.
- */
- public void increment() {
- if (bottomValue == topValue) {
- return;
- }
- value += smallChange;
- if (value > bottomValue) {
- value = bottomValue;
- }
- }
-
- /**
- * Perform a big step change up.
- */
- public void bigDecrement() {
- if (bottomValue == topValue) {
- return;
- }
- value -= bigChange;
- if (value < topValue) {
- value = topValue;
- }
- }
-
- /**
- * Perform a big step change down.
- */
- public void bigIncrement() {
- if (bottomValue == topValue) {
- return;
- }
- value += bigChange;
- if (value > bottomValue) {
- value = bottomValue;
- }
- }
-
- /**
- * Go to the top edge of the scroller.
- */
- public void toTop() {
- value = topValue;
- }
-
- /**
- * Go to the bottom edge of the scroller.
- */
- public void toBottom() {
- value = bottomValue;
- }
-
- /**
- * Handle mouse button releases.
- *
- * @param mouse mouse button release event
- */
- @Override
- public void onMouseUp(final TMouseEvent mouse) {
- if (bottomValue == topValue) {
- return;
- }
-
- if (inScroll) {
- inScroll = false;
- return;
- }
-
- if ((mouse.getX() == 0)
- && (mouse.getY() == 0)
- ) {
- // Clicked on the top arrow
- decrement();
- return;
- }
-
- if ((mouse.getX() == 0)
- && (mouse.getY() == getHeight() - 1)
- ) {
- // Clicked on the bottom arrow
- increment();
- return;
- }
-
- if ((mouse.getX() == 0)
- && (mouse.getY() > 0)
- && (mouse.getY() < boxPosition())
- ) {
- // Clicked between the top arrow and the box
- value -= bigChange;
- if (value < topValue) {
- value = topValue;
- }
- return;
- }
-
- if ((mouse.getX() == 0)
- && (mouse.getY() > boxPosition())
- && (mouse.getY() < getHeight() - 1)
- ) {
- // Clicked between the box and the bottom arrow
- value += bigChange;
- if (value > bottomValue) {
- value = bottomValue;
- }
- return;
- }
- }
-
- /**
- * Handle mouse movement events.
- *
- * @param mouse mouse motion event
- */
- @Override
- public void onMouseMotion(final TMouseEvent mouse) {
- if (bottomValue == topValue) {
- return;
- }
-
- if ((mouse.isMouse1())
- && (inScroll)
- && (mouse.getY() > 0)
- && (mouse.getY() < getHeight() - 1)
- ) {
- // Recompute value based on new box position
- value = (bottomValue - topValue)
- * (mouse.getY()) / (getHeight() - 3) + topValue;
- return;
- }
-
- inScroll = false;
- }
-
- /**
- * Handle mouse press events.
- *
- * @param mouse mouse button press event
- */
- @Override
- public void onMouseDown(final TMouseEvent mouse) {
- if (bottomValue == topValue) {
- return;
- }
-
- if ((mouse.getX() == 0)
- && (mouse.getY() == boxPosition())
- ) {
- inScroll = true;
- return;
- }
- }
-
-}
git://git.nikiroo.be / fanfix.git / blobdiff