/**
* Copyright (c) 2008-2012 Ardor Labs, Inc.
*
* This file is part of Ardor3D.
*
* Ardor3D is free software: you can redistribute it and/or modify it
* under the terms of its license which may be found in the accompanying
* LICENSE file or at <http://www.ardor3d.com/LICENSE>.
*/
package com.ardor3d.extension.ui.text;
import java.nio.FloatBuffer;
import java.util.List;
import com.ardor3d.extension.ui.UIComponent;
import com.ardor3d.extension.ui.text.RenderedText.RenderedTextData;
import com.ardor3d.math.ColorRGBA;
import com.ardor3d.math.type.ReadOnlyTransform;
import com.ardor3d.renderer.IndexMode;
import com.ardor3d.renderer.Renderer;
import com.ardor3d.renderer.state.BlendState;
import com.ardor3d.renderer.state.BlendState.DestinationFunction;
import com.ardor3d.renderer.state.BlendState.SourceFunction;
import com.ardor3d.scenegraph.Mesh;
import com.ardor3d.scenegraph.MeshData;
import com.ardor3d.util.geom.BufferUtils;
import com.google.common.collect.Lists;
public abstract class TextSelection {
protected int _startIndex = -1;
protected int _endIndex = -1;
protected SelectionState _state = SelectionState.NO_SELECTION;
/** The mesh used to render this selection. */
protected Mesh _standin;
public TextSelection() {
_standin = createSelectionMesh();
}
/**
* @return the current caret position within the component whose selection we are tracking.
*/
public abstract int getCaretPosition();
/**
* @return the data object of the text associated with this selection.
*/
public abstract RenderedTextData getTextData();
public int getSelectionLength() {
if (_startIndex == -1 || _endIndex == -1) {
return 0;
} else {
return _endIndex - _startIndex;
}
}
public void reset() {
_startIndex = _endIndex = -1;
_state = SelectionState.NO_SELECTION;
}
public int getEndIndex() {
return _endIndex;
}
public void setEndIndex(final int endIndex) {
_endIndex = endIndex;
updateMesh();
}
public int getStartIndex() {
return _startIndex;
}
public void setStartIndex(final int startIndex) {
_startIndex = startIndex;
updateMesh();
}
public SelectionState getState() {
return _state;
}
public void setState(final SelectionState state) {
_state = state;
}
/**
* Alter the selection as if the "shift" and "up" keys are pressed.
*/
public void upKey() {
if (_state != SelectionState.NO_SELECTION && getSelectionLength() == 0) {
_state = SelectionState.AT_START_OF_SELECTION;
}
if (_state == SelectionState.AT_END_OF_SELECTION) {
if (getCaretPosition() < _startIndex) {
_endIndex = _startIndex;
_startIndex = getCaretPosition();
_state = SelectionState.AT_START_OF_SELECTION;
} else {
_endIndex = getCaretPosition();
}
} else if (_state == SelectionState.AT_START_OF_SELECTION) {
_startIndex = getCaretPosition();
}
updateMesh();
}
/**
* Alter the selection as if the "shift" and "down" keys are pressed.
*/
public void downKey() {
if (_state != SelectionState.NO_SELECTION && getSelectionLength() == 0) {
_state = SelectionState.AT_END_OF_SELECTION;
}
if (_state == SelectionState.AT_END_OF_SELECTION) {
_endIndex = getCaretPosition();
} else if (_state == SelectionState.AT_START_OF_SELECTION) {
if (getCaretPosition() > _endIndex) {
_startIndex = _endIndex;
_endIndex = getCaretPosition();
_state = SelectionState.AT_END_OF_SELECTION;
} else {
_startIndex = getCaretPosition();
}
}
updateMesh();
}
/**
* Alter the selection as if the "shift" and "left" keys are pressed.
*/
public void leftKey() {
if (_state != SelectionState.NO_SELECTION && getSelectionLength() == 0) {
_state = SelectionState.AT_START_OF_SELECTION;
}
if (_state == SelectionState.AT_END_OF_SELECTION) {
_endIndex = getCaretPosition();
} else if (_state == SelectionState.AT_START_OF_SELECTION) {
_startIndex = getCaretPosition();
}
updateMesh();
}
/**
* Alter the selection as if the "shift" and "right" keys are pressed.
*/
public void rightKey() {
if (_state != SelectionState.NO_SELECTION && getSelectionLength() == 0) {
_state = SelectionState.AT_END_OF_SELECTION;
}
if (_state == SelectionState.AT_END_OF_SELECTION) {
_endIndex = getCaretPosition();
} else if (_state == SelectionState.AT_START_OF_SELECTION) {
_startIndex = getCaretPosition();
}
updateMesh();
}
public void checkStart() {
if (_state == SelectionState.NO_SELECTION) {
final int caretPosition = getCaretPosition();
_startIndex = caretPosition;
_endIndex = caretPosition;
_state = SelectionState.AT_END_OF_SELECTION;
}
}
private void updateMesh() {
final int selLength = getSelectionLength();
if (selLength == 0) {
return;
}
// Make triangle strips for each line.
final RenderedTextData data = getTextData();
float xStart = 0, xEnd = 0, height = 0, yOffset = 0;
boolean exit = false;
final List<Float> verts = Lists.newArrayList();
for (int j = 0; !exit && j < data._lineEnds.size(); j++) {
height = data._lineHeights.get(j);
final int end = data._lineEnds.get(j);
if (_startIndex > end) {
continue;
} else if (_startIndex <= end) {
xStart = data._xStarts.get(_startIndex);
} else {
xStart = 0;
}
if (_endIndex <= end) {
// last strip
final CharacterDescriptor charDesc = data._characters.get(_endIndex - 1);
xEnd = data._xStarts.get(_endIndex - 1)
+ (int) Math.round(charDesc.getScale() * charDesc.getXAdvance());
exit = true;
} else {
final CharacterDescriptor charDesc = data._characters.get(end);
xEnd = data._xStarts.get(end) + (int) Math.round(charDesc.getScale() * charDesc.getXAdvance());
}
verts.add(xStart);
verts.add(yOffset);
verts.add(0f);
verts.add(xEnd);
verts.add(yOffset);
verts.add(0f);
verts.add(xStart);
verts.add(yOffset + height);
verts.add(0f);
verts.add(xStart);
verts.add(yOffset + height);
verts.add(0f);
verts.add(xEnd);
verts.add(yOffset);
verts.add(0f);
verts.add(xEnd);
verts.add(yOffset + height);
verts.add(0f);
yOffset += height;
}
final MeshData mData = _standin.getMeshData();
mData.setVertexBuffer(BufferUtils.createVector3Buffer(mData.getVertexBuffer(), verts.size()));
final FloatBuffer vertBuffer = mData.getVertexBuffer();
for (final float f : verts) {
vertBuffer.put(f);
}
}
public void draw(final Renderer renderer, final ReadOnlyTransform xform) {
if (getSelectionLength() == 0) {
return;
}
// set our alpha
final ColorRGBA color = ColorRGBA.fetchTempInstance();
color.set(_standin.getDefaultColor()).setAlpha(UIComponent.getCurrentOpacity());
_standin.setDefaultColor(color);
ColorRGBA.releaseTempInstance(color);
// set our location
_standin.setWorldTransform(xform);
// draw
_standin.render(renderer);
}
protected Mesh createSelectionMesh() {
final Mesh mesh = new Mesh("selectionMesh");
final MeshData mData = mesh.getMeshData();
mData.setVertexBuffer(BufferUtils.createVector3Buffer(6));
mData.setIndexMode(IndexMode.Triangles);
final BlendState blend = new BlendState();
blend.setBlendEnabled(true);
blend.setSourceFunction(SourceFunction.SourceAlpha);
blend.setDestinationFunction(DestinationFunction.OneMinusSourceAlpha);
mesh.setRenderState(blend);
mesh.updateWorldRenderStates(false);
mesh.setDefaultColor(ColorRGBA.LIGHT_GRAY);
return mesh;
}
public enum SelectionState {
/**
* No selection is currently made.
*/
NO_SELECTION,
/**
* We have a selection and our caret is currently at the end of that selection.
*/
AT_END_OF_SELECTION,
/**
* We have a selection and our caret is currently at the start of that selection.
*/
AT_START_OF_SELECTION;
}
}