package org.mmin.handycalc;
import ...;
public class MyGridLayout extends ViewGroup {
// To view the full code, download the archive file http://www.anddev.org/files/handycalc_library_155.zip and import it in eclipse.
public static class LayoutParams extends
android.view.ViewGroup.LayoutParams {
// ...
public LayoutParams(Context c, AttributeSet attrs) {
super(10, 10);
// get the layout attributes of it's child view from the xml layout file.
android.content.Resources.StyledAttributes a = c
.obtainStyledAttributes(attrs,
R.styleable.MyGridLayout_Layout);
this.columnStart = a.getInt(
R.styleable.MyGridLayout_Layout_layout_columnStart, 0);
this.rowStart = a.getInt(
R.styleable.MyGridLayout_Layout_layout_rowStart, 0);
this.columnEnd = a.getInt(
R.styleable.MyGridLayout_Layout_layout_columnEnd,
this.columnStart + 1);
this.rowEnd = a.getInt(
R.styleable.MyGridLayout_Layout_layout_rowEnd,
this.rowStart + 1);
a.recycle();
}
}
public MyGridLayout(Context context, AttributeSet attrs, Map inflateParams) {
super(context, attrs, inflateParams);
readAttr(context, attrs);
}
public MyGridLayout(Context context, AttributeSet attrs, Map inflateParams,
int defStyle) {
super(context, attrs, inflateParams, defStyle);
readAttr(context, attrs);
}
private void readAttr(Context c, AttributeSet attrs) {
android.content.Resources.StyledAttributes a = c
.obtainStyledAttributes(attrs, R.styleable.MyGridLayout);
this.rows = a.getInt(R.styleable.MyGridLayout_rows, 1);
this.columns = a.getInt(R.styleable.MyGridLayout_columns, 1);
this.preferredCellWidth = a.getDimension(
R.styleable.MyGridLayout_preferredCellWidth, 1);
this.preferredCellHeight = a.getDimension(
R.styleable.MyGridLayout_preferredCellHeight, 1);
a.recycle();
}
private int rows;
private int columns;
private float preferredCellWidth;
private float preferredCellHeight;
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int widthSize = MeasureSpec.getSize(widthMeasureSpec);
int widthMode = MeasureSpec.getMode(widthMeasureSpec);
int heightSize = MeasureSpec.getSize(heightMeasureSpec);
int heightMode = MeasureSpec.getMode(heightMeasureSpec);
float cellWidth = preferredCellWidth(), cellHeight = preferredCellHeight();
if (widthMode == MeasureSpec.EXACTLY
|| widthMode == MeasureSpec.AT_MOST) {
float width = widthSize;
width = width - mPaddingLeft - mPaddingRight;
width /= columns();
if (widthMode == MeasureSpec.EXACTLY)
cellWidth = width;
else
cellWidth = Math.min(cellWidth, width);
}
if (heightMode == MeasureSpec.EXACTLY
|| heightMode == MeasureSpec.AT_MOST) {
float height = heightSize;
height = height - mPaddingTop - mPaddingBottom;
height /= rows();
if (heightMode == MeasureSpec.EXACTLY)
cellHeight = height;
else
cellHeight = Math.min(cellHeight, height);
}
int count = getChildCount();
for (int i = 0; i < count; i++) {
View child = getChildAt(i);
if (child.getVisibility() != GONE) {
LayoutParams lp = (LayoutParams) child.getLayoutParams();
int width = (int) Math.round(cellWidth * lp.width());
int height = (int) Math.round(cellHeight * lp.height());
child.measure(MeasureSpec.makeMeasureSpec(width,
MeasureSpec.EXACTLY), MeasureSpec.makeMeasureSpec(
height, MeasureSpec.EXACTLY));
}
}
setMeasuredDimension((int) Math.round(cellWidth * columns()
+ mPaddingLeft + mPaddingRight), (int) Math.round(cellHeight
* rows() + mPaddingTop + mPaddingBottom));
}
private int lastWidth, lastHeight;
@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
int width = r - l;
int height = b - t;
if (lastWidth == width && lastHeight == height)
return;
float cellWidth = width, cellHeight = height;
cellWidth = cellWidth - mPaddingLeft - mPaddingRight;
cellHeight = cellHeight - mPaddingTop - mPaddingBottom;
cellWidth /= columns();
cellHeight /= rows();
int count = getChildCount();
for (int i = 0; i < count; i++) {
View child = getChildAt(i);
if (child.getVisibility() != GONE) {
LayoutParams lp = (LayoutParams) child.getLayoutParams();
int cl = (int) Math.round(mPaddingLeft + lp.columnStart
* cellWidth);
int ct = (int) Math.round(mPaddingTop + lp.rowStart
* cellHeight);
int cr = (int) Math.round(mPaddingLeft + lp.columnEnd
* cellWidth);
int cb = (int) Math.round(mPaddingTop + lp.rowEnd * cellHeight);
child.layout(cl, ct, cr, cb);
}
}
lastWidth = width;
lastHeight = height;
}
public android.view.ViewGroup.LayoutParams generateLayoutParams(
AttributeSet attrs) {
// let the MyGridLayout.LayoutParams to read attributes of layout instead of ViewGroup.LayoutParams
return new LayoutParams(getContext(), attrs);
}
protected boolean checkLayoutParams(android.view.ViewGroup.LayoutParams p) {
// if the layout params is invalid, the android will throw a runtime exception.
if (p instanceof LayoutParams) {
int columns = columns(), rows = rows();
LayoutParams lp = (LayoutParams) p;
if (lp.columnEnd > columns || lp.columnStart < 0)
return false;
if (lp.rowEnd > rows || lp.rowStart < 0)
return false;
return lp.columnEnd > lp.columnStart && lp.rowEnd > lp.rowStart;
} else
return false;
}
}
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