InternalSelectionFocuspublic class InternalSelectionFocus extends android.app.Activity | {@link android.view.View#requestFocus(int, android.graphics.Rect)}
and
{@link android.view.View#onFocusChanged(boolean, int, android.graphics.Rect)}
work together to give a newly focused item a hint about the most interesting
rectangle of the previously focused view. The view taking focus can use this
to set an internal selection more appropriate using this rect.
This Activity excercises that behavior using three adjacent {@link InternalSelectionView}
that report interesting rects when giving up focus, and use interesting rects
when taking focus to best select the internal row to show as selected.
Were {@link InternalSelectionView} not to override {@link android.view.View#getFocusedRect}, or
{@link android.view.View#onFocusChanged(boolean, int, android.graphics.Rect)}, the focus would
jump to some default internal selection (the top) and not allow for the smooth handoff. |
| Methods Summary |
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| protected void | onCreate(android.os.Bundle savedInstanceState)
super.onCreate(savedInstanceState);
final LinearLayout layout = new LinearLayout(this);
layout.setOrientation(LinearLayout.HORIZONTAL);
layout.setLayoutParams(new ViewGroup.LayoutParams(
ViewGroup.LayoutParams.FILL_PARENT,
ViewGroup.LayoutParams.FILL_PARENT));
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(0,
ViewGroup.LayoutParams.FILL_PARENT, 1);
final InternalSelectionView leftColumn = new InternalSelectionView(this, 5, "left column");
leftColumn.setLayoutParams(params);
leftColumn.setPadding(10, 10, 10, 10);
layout.addView(leftColumn);
final InternalSelectionView middleColumn = new InternalSelectionView(this, 5, "middle column");
middleColumn.setLayoutParams(params);
middleColumn.setPadding(10, 10, 10, 10);
layout.addView(middleColumn);
final InternalSelectionView rightColumn = new InternalSelectionView(this, 5, "right column");
rightColumn.setLayoutParams(params);
rightColumn.setPadding(10, 10, 10, 10);
layout.addView(rightColumn);
setContentView(layout);
|
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