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Introduce FastScrollGuardListView

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This is a hack to work around androids stupid 48dip fast-scroll area: The framework will hijack any scroll events which happen
near (=48 dp) the fast scroll bar. We do not want this as it clashes with our expand buttons.

This class intercepts events in the problematic area and rewrites them to a fake event to pretend that the touch did not happen in the fastscroll area
This commit is contained in:
Adrian Ulrich 2016-04-04 20:52:06 +02:00
parent 39437ec287
commit a3b4eefe09
2 changed files with 80 additions and 1 deletions
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2
res/layout/listview.xml
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@ -20,7 +20,7 @@ LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
-->
<ListView
<ch.blinkenlights.android.vanilla.FastScrollGuardedListView
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"

79
src/ch/blinkenlights/android/vanilla/FastScrollGuardedListView.java Normal file
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@ -0,0 +1,79 @@
/*
* Copyright (C) 2016 Adrian Ulrich <adrian@blinkenlights.ch>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package ch.blinkenlights.android.vanilla;
import android.content.Context;
import android.content.res.Resources;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.widget.ListView;
public class FastScrollGuardedListView extends ListView {
/**
* Start edgeProtection at width-start
*/
private static final int PROTECT_START_DP = 50; // AOSP has this set to 48dip in 5.x
/**
* End protection at width-end
*/
private static final int PROTECT_END_DP = 12;
/**
* The calculated start position in pixel
*/
private float mEdgeProtectStartPx = 0;
/**
* The calculated end position in pixel
*/
private float mEdgeProtectEndPx = 0;
public FastScrollGuardedListView(Context context) {
super(context);
}
public FastScrollGuardedListView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public FastScrollGuardedListView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
public FastScrollGuardedListView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
super(context, attrs, defStyleAttr, defStyleRes);
}
/**
* Intercepted touch event from ListView
* We will use this callback to send fake X-coord events if
* the actual event happened in the protected area (eg: the hardcoded fastscroll area)
*/
@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
if (mEdgeProtectStartPx == 0)
mEdgeProtectStartPx = getWidth() - PROTECT_START_DP * Resources.getSystem().getDisplayMetrics().density;
if (mEdgeProtectEndPx == 0)
mEdgeProtectEndPx = getWidth() - PROTECT_END_DP * Resources.getSystem().getDisplayMetrics().density;
if (ev.getX() > mEdgeProtectStartPx && ev.getX() < mEdgeProtectEndPx) {
// Cursor is in protected area: simulate an event with a faked x coordinate
ev = MotionEvent.obtain(ev.getDownTime(), ev.getEventTime(), ev.getAction(), mEdgeProtectStartPx, ev.getY(), ev.getMetaState());
}
return super.onInterceptTouchEvent(ev);
}
}