package com.glanznig.beepme.helper;
/*
Copyright (c) 2011, Artem Votincev (apmem.org)
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
* Neither the name of the apmem.org nor the
names of its contributors may be used to endorse or promote products
derived from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL ARTEM VOTINCEV BE LIABLE FOR ANY
DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
See http://github.com/ApmeM/android-flowlayout
*/
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup;
import com.glanznig.beepme.R;
public class FlowLayout extends ViewGroup {
public static final int HORIZONTAL = 0;
public static final int VERTICAL = 1;
private int horizontalSpacing = 0;
private int verticalSpacing = 0;
private int orientation = 0;
private boolean debugDraw = false;
public FlowLayout(Context context) {
super(context);
this.readStyleParameters(context, null);
}
public FlowLayout(Context context, AttributeSet attributeSet) {
super(context, attributeSet);
this.readStyleParameters(context, attributeSet);
}
public FlowLayout(Context context, AttributeSet attributeSet, int defStyle) {
super(context, attributeSet, defStyle);
this.readStyleParameters(context, attributeSet);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int sizeWidth = MeasureSpec.getSize(widthMeasureSpec) - this.getPaddingRight() - this.getPaddingLeft();
int sizeHeight = MeasureSpec.getSize(heightMeasureSpec) - this.getPaddingTop() - this.getPaddingBottom();
int modeWidth = MeasureSpec.getMode(widthMeasureSpec);
int modeHeight = MeasureSpec.getMode(heightMeasureSpec);
int size;
int mode;
if (orientation == HORIZONTAL) {
size = sizeWidth;
mode = modeWidth;
} else {
size = sizeHeight;
mode = modeHeight;
}
int lineThicknessWithSpacing = 0;
int lineThickness = 0;
int lineLengthWithSpacing = 0;
int lineLength;
int prevLinePosition = 0;
int controlMaxLength = 0;
int controlMaxThickness = 0;
final int count = getChildCount();
for (int i = 0; i < count; i++) {
final View child = getChildAt(i);
if (child.getVisibility() == GONE) {
continue;
}
LayoutParams lp = (LayoutParams) child.getLayoutParams();
child.measure(
getChildMeasureSpec(widthMeasureSpec, this.getPaddingLeft() + this.getPaddingRight(), lp.width),
getChildMeasureSpec(heightMeasureSpec, this.getPaddingTop() + this.getPaddingBottom(), lp.height)
);
int hSpacing = this.getHorizontalSpacing(lp);
int vSpacing = this.getVerticalSpacing(lp);
int childWidth = child.getMeasuredWidth();
int childHeight = child.getMeasuredHeight();
int childLength;
int childThickness;
int spacingLength;
int spacingThickness;
if (orientation == HORIZONTAL) {
childLength = childWidth;
childThickness = childHeight;
spacingLength = hSpacing;
spacingThickness = vSpacing;
} else {
childLength = childHeight;
childThickness = childWidth;
spacingLength = vSpacing;
spacingThickness = hSpacing;
}
lineLength = lineLengthWithSpacing + childLength;
lineLengthWithSpacing = lineLength + spacingLength;
boolean newLine = lp.newLine || (mode != MeasureSpec.UNSPECIFIED && lineLength > size);
if (newLine) {
prevLinePosition = prevLinePosition + lineThicknessWithSpacing;
lineThickness = childThickness;
lineLength = childLength;
lineThicknessWithSpacing = childThickness + spacingThickness;
lineLengthWithSpacing = lineLength + spacingLength;
}
lineThicknessWithSpacing = Math.max(lineThicknessWithSpacing, childThickness + spacingThickness);
lineThickness = Math.max(lineThickness, childThickness);
int posX;
int posY;
if (orientation == HORIZONTAL) {
posX = getPaddingLeft() + lineLength - childLength;
posY = getPaddingTop() + prevLinePosition;
} else {
posX = getPaddingLeft() + prevLinePosition;
posY = getPaddingTop() + lineLength - childHeight;
}
lp.setPosition(posX, posY);
controlMaxLength = Math.max(controlMaxLength, lineLength);
controlMaxThickness = prevLinePosition + lineThickness;
}
/* need to take paddings into account */
if (orientation == HORIZONTAL) {
controlMaxLength += getPaddingLeft() + getPaddingRight();
controlMaxThickness += getPaddingBottom() + getPaddingTop();
} else {
controlMaxLength += getPaddingBottom() + getPaddingTop();
controlMaxThickness += getPaddingLeft() + getPaddingRight();
}
if (orientation == HORIZONTAL) {
this.setMeasuredDimension(resolveSize(controlMaxLength, widthMeasureSpec), resolveSize(controlMaxThickness, heightMeasureSpec));
} else {
this.setMeasuredDimension(resolveSize(controlMaxThickness, widthMeasureSpec), resolveSize(controlMaxLength, heightMeasureSpec));
}
}
private int getVerticalSpacing(LayoutParams lp) {
int vSpacing;
if (lp.verticalSpacingSpecified()) {
vSpacing = lp.verticalSpacing;
} else {
vSpacing = this.verticalSpacing;
}
return vSpacing;
}
private int getHorizontalSpacing(LayoutParams lp) {
int hSpacing;
if (lp.horizontalSpacingSpecified()) {
hSpacing = lp.horizontalSpacing;
} else {
hSpacing = this.horizontalSpacing;
}
return hSpacing;
}
@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
final int count = getChildCount();
for (int i = 0; i < count; i++) {
View child = getChildAt(i);
LayoutParams lp = (LayoutParams) child.getLayoutParams();
child.layout(lp.x, lp.y, lp.x + child.getMeasuredWidth(), lp.y + child.getMeasuredHeight());
}
}
@Override
protected boolean drawChild(Canvas canvas, View child, long drawingTime) {
boolean more = super.drawChild(canvas, child, drawingTime);
this.drawDebugInfo(canvas, child);
return more;
}
@Override
protected boolean checkLayoutParams(ViewGroup.LayoutParams p) {
return p instanceof LayoutParams;
}
@Override
protected LayoutParams generateDefaultLayoutParams() {
return new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
}
@Override
public LayoutParams generateLayoutParams(AttributeSet attributeSet) {
return new LayoutParams(getContext(), attributeSet);
}
@Override
protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) {
return new LayoutParams(p);
}
private void readStyleParameters(Context context, AttributeSet attributeSet) {
TypedArray a = context.obtainStyledAttributes(attributeSet, R.styleable.FlowLayout);
try {
horizontalSpacing = a.getDimensionPixelSize(R.styleable.FlowLayout_horizontalSpacing, 0);
verticalSpacing = a.getDimensionPixelSize(R.styleable.FlowLayout_verticalSpacing, 0);
orientation = a.getInteger(R.styleable.FlowLayout_orientation, HORIZONTAL);
debugDraw = a.getBoolean(R.styleable.FlowLayout_debugDraw, false);
} finally {
a.recycle();
}
}
private void drawDebugInfo(Canvas canvas, View child) {
if (!debugDraw) {
return;
}
Paint childPaint = this.createPaint(0xffffff00);
Paint layoutPaint = this.createPaint(0xff00ff00);
Paint newLinePaint = this.createPaint(0xffff0000);
LayoutParams lp = (LayoutParams) child.getLayoutParams();
if (lp.horizontalSpacing > 0) {
float x = child.getRight();
float y = child.getTop() + child.getHeight() / 2.0f;
canvas.drawLine(x, y, x + lp.horizontalSpacing, y, childPaint);
canvas.drawLine(x + lp.horizontalSpacing - 4.0f, y - 4.0f, x + lp.horizontalSpacing, y, childPaint);
canvas.drawLine(x + lp.horizontalSpacing - 4.0f, y + 4.0f, x + lp.horizontalSpacing, y, childPaint);
} else if (this.horizontalSpacing > 0) {
float x = child.getRight();
float y = child.getTop() + child.getHeight() / 2.0f;
canvas.drawLine(x, y, x + this.horizontalSpacing, y, layoutPaint);
canvas.drawLine(x + this.horizontalSpacing - 4.0f, y - 4.0f, x + this.horizontalSpacing, y, layoutPaint);
canvas.drawLine(x + this.horizontalSpacing - 4.0f, y + 4.0f, x + this.horizontalSpacing, y, layoutPaint);
}
if (lp.verticalSpacing > 0) {
float x = child.getLeft() + child.getWidth() / 2.0f;
float y = child.getBottom();
canvas.drawLine(x, y, x, y + lp.verticalSpacing, childPaint);
canvas.drawLine(x - 4.0f, y + lp.verticalSpacing - 4.0f, x, y + lp.verticalSpacing, childPaint);
canvas.drawLine(x + 4.0f, y + lp.verticalSpacing - 4.0f, x, y + lp.verticalSpacing, childPaint);
} else if (this.verticalSpacing > 0) {
float x = child.getLeft() + child.getWidth() / 2.0f;
float y = child.getBottom();
canvas.drawLine(x, y, x, y + this.verticalSpacing, layoutPaint);
canvas.drawLine(x - 4.0f, y + this.verticalSpacing - 4.0f, x, y + this.verticalSpacing, layoutPaint);
canvas.drawLine(x + 4.0f, y + this.verticalSpacing - 4.0f, x, y + this.verticalSpacing, layoutPaint);
}
if (lp.newLine) {
if (orientation == HORIZONTAL) {
float x = child.getLeft();
float y = child.getTop() + child.getHeight() / 2.0f;
canvas.drawLine(x, y - 6.0f, x, y + 6.0f, newLinePaint);
} else {
float x = child.getLeft() + child.getWidth() / 2.0f;
float y = child.getTop();
canvas.drawLine(x - 6.0f, y, x + 6.0f, y, newLinePaint);
}
}
}
private Paint createPaint(int color) {
Paint paint = new Paint();
paint.setAntiAlias(true);
paint.setColor(color);
paint.setStrokeWidth(2.0f);
return paint;
}
public static class LayoutParams extends ViewGroup.LayoutParams {
private static int NO_SPACING = -1;
private int x;
private int y;
private int horizontalSpacing = NO_SPACING;
private int verticalSpacing = NO_SPACING;
private boolean newLine = false;
public LayoutParams(Context context, AttributeSet attributeSet) {
super(context, attributeSet);
this.readStyleParameters(context, attributeSet);
}
public LayoutParams(int width, int height) {
super(width, height);
}
public LayoutParams(ViewGroup.LayoutParams layoutParams) {
super(layoutParams);
}
public boolean horizontalSpacingSpecified() {
return horizontalSpacing != NO_SPACING;
}
public boolean verticalSpacingSpecified() {
return verticalSpacing != NO_SPACING;
}
public void setPosition(int x, int y) {
this.x = x;
this.y = y;
}
private void readStyleParameters(Context context, AttributeSet attributeSet) {
TypedArray a = context.obtainStyledAttributes(attributeSet, R.styleable.FlowLayout_LayoutParams);
try {
horizontalSpacing = a.getDimensionPixelSize(R.styleable.FlowLayout_LayoutParams_layout_horizontalSpacing, NO_SPACING);
verticalSpacing = a.getDimensionPixelSize(R.styleable.FlowLayout_LayoutParams_layout_verticalSpacing, NO_SPACING);
newLine = a.getBoolean(R.styleable.FlowLayout_LayoutParams_layout_newLine, false);
} finally {
a.recycle();
}
}
}
}