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Added setVerticalSectionFadingEdgeEnabled. #22

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Added setVerticalSectionFadingEdgeEnabled. #22

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66 changes: 63 additions & 3 deletions library/src/za/co/immedia/pinnedheaderlistview/PinnedHeaderListView.java
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Original file line number Diff line number Diff line change
Expand Up @@ -2,6 +2,9 @@

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.drawable.GradientDrawable;
import android.graphics.drawable.GradientDrawable.Orientation;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup;
Expand Down Expand Up @@ -33,6 +36,13 @@ public static interface PinnedSectionedHeaderAdapter {
private int mCurrentSection = 0;
private int mWidthMode;
private int mHeightMode;

// For shadow drawing.
private double mMinSectionsDistanceY;
private double mShadowHeight;
private GradientDrawable mGradientDrawable = null;
private boolean shouldShowShadow = false;
private boolean verticalSectionFadingEdgeEnabled = false;

public PinnedHeaderListView(Context context) {
super(context);
Expand All @@ -49,6 +59,18 @@ public PinnedHeaderListView(Context context, AttributeSet attrs, int defStyle) {
super.setOnScrollListener(this);
}

public void setVerticalSectionFadingEdgeEnabled(boolean verticalSectionFadingEdgeEnabled) {
this.verticalSectionFadingEdgeEnabled = verticalSectionFadingEdgeEnabled;
}

private void initShadowDrawable() {
if (mGradientDrawable == null) {
mGradientDrawable = new GradientDrawable(Orientation.TOP_BOTTOM,
new int[] { Color.parseColor("#ffa0a0a0"), Color.parseColor("#50a0a0a0"), Color.parseColor("#00a0a0a0")});
mShadowHeight = 8.0 * getResources().getDisplayMetrics().density;
}
}

public void setPinHeaders(boolean shouldPin) {
mShouldPin = shouldPin;
}
Expand Down Expand Up @@ -88,19 +110,44 @@ public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCoun

mHeaderOffset = 0.0f;

final float pinnedHeaderHeight = mCurrentHeader.getMeasuredHeight();

mMinSectionsDistanceY = Float.MAX_VALUE;
for (int i = firstVisibleItem; i < firstVisibleItem + visibleItemCount; i++) {
if (mAdapter.isSectionHeader(i)) {
View header = getChildAt(i - firstVisibleItem);
float headerTop = header.getTop();
float pinnedHeaderHeight = mCurrentHeader.getMeasuredHeight();
header.setVisibility(VISIBLE);

if (i != firstVisibleItem) {
mMinSectionsDistanceY = Math.min(mMinSectionsDistanceY, Math.max(0, headerTop - pinnedHeaderHeight));
}

if (pinnedHeaderHeight >= headerTop && headerTop > 0) {
mHeaderOffset = headerTop - header.getHeight();
mHeaderOffset = headerTop - pinnedHeaderHeight;
} else if (headerTop <= 0) {
header.setVisibility(INVISIBLE);
}
}
}

if (verticalSectionFadingEdgeEnabled) {
if (firstVisibleItem == 0) {
View sectionView = getChildAt(0);
if (sectionView.getTop() == getPaddingTop()) {
// Section sticks to the top, no need for pinned shadow.
shouldShowShadow = false;
} else {
// Section doesn't stick to the top, make sure we have a pinned shadow.
shouldShowShadow = true;
}
} else {
// Section doesn't stick to the top, make sure we have a pinned shadow.
shouldShowShadow = true;
}
} else {
shouldShowShadow = false;
}

invalidate();
}
Expand Down Expand Up @@ -147,11 +194,24 @@ protected void dispatchDraw(Canvas canvas) {
return;
int saveCount = canvas.save();
canvas.translate(0, mHeaderOffset);
canvas.clipRect(0, 0, getWidth(), mCurrentHeader.getMeasuredHeight()); // needed

double clipHeight = mCurrentHeader.getMeasuredHeight() + (shouldShowShadow ? Math.min(mShadowHeight, mMinSectionsDistanceY) : 0);
canvas.clipRect(0, 0, getWidth(), (int)clipHeight); // needed
// for
// <
// HONEYCOMB
mCurrentHeader.draw(canvas);

if (shouldShowShadow) {
initShadowDrawable();

mGradientDrawable.setBounds(mCurrentHeader.getLeft(),
mCurrentHeader.getBottom(),
mCurrentHeader.getRight(),
(int)(mCurrentHeader.getBottom() + mShadowHeight));
mGradientDrawable.draw(canvas);
}

canvas.restoreToCount(saveCount);
}

Expand Down