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Code Issues Packages Projects Releases Wiki Activity

Use GestureDetector rather than doing it on our own.

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This commit is contained in:
Dennis Guse
2019-11-27 21:42:05 +01:00
parent 1432fed8f9
commit 88cdcd4b47
1 changed files with 81 additions and 94 deletions
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src/main/java/de/dennisguse/opentracks/chart/ChartView.java
+81 -94
View File
@@ -27,12 +27,14 @@ import android.graphics.Paint.Style;
import android.graphics.Path;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.view.GestureDetector;
import android.view.MotionEvent;
import android.view.VelocityTracker;
import android.view.ScaleGestureDetector;
import android.view.View;
import android.view.ViewConfiguration;
import android.widget.Scroller;
import androidx.core.view.GestureDetectorCompat;
import java.text.NumberFormat;
import java.util.ArrayList;
@@ -94,8 +96,6 @@ public class ChartView extends View {
private final int markerHeight;
private final Scroller scroller;
private double maxX = 1.0;
private VelocityTracker velocityTracker = null;
private float lastMotionEventX = -1;
private int zoomLevel = 1;
private int leftBorder = BORDER;
@@ -115,11 +115,76 @@ public class ChartView extends View {
private boolean reportSpeed = true;
private boolean showPointer = false;
/**
* Constructor.
*
* @param context the context
*/
private GestureDetectorCompat detectorScrollFlingTab = new GestureDetectorCompat(getContext(), new GestureDetector.SimpleOnGestureListener() {
@Override
public boolean onDown(MotionEvent e) {
if (!scroller.isFinished()) {
scroller.abortAnimation();
}
return true;
}
@Override
public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {
if (Math.abs(distanceX) > 0) {
int availableToScroll = effectiveWidth * (zoomLevel - 1) - getScrollX();
if (availableToScroll > 0) {
scrollBy(Math.min(availableToScroll, (int) distanceX));
}
}
return true;
}
@Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
fling((int) -velocityX);
return true;
}
@Override
public boolean onSingleTapConfirmed(MotionEvent event) {
// Check if the y event is within markerHeight of the marker center
if (Math.abs(event.getY() - topBorder - spacer - markerHeight / 2) < markerHeight) {
int minDistance = Integer.MAX_VALUE;
Waypoint nearestWaypoint = null;
synchronized (waypoints) {
for (Waypoint waypoint : waypoints) {
int distance = Math.abs(getX(getWaypointXValue(waypoint)) - (int) event.getX() - getScrollX());
if (distance < minDistance) {
minDistance = distance;
nearestWaypoint = waypoint;
}
}
}
if (nearestWaypoint != null && minDistance < markerWidth) {
Intent intent = IntentUtils.newIntent(getContext(), MarkerDetailActivity.class)
.putExtra(MarkerDetailActivity.EXTRA_MARKER_ID, nearestWaypoint.getId());
getContext().startActivity(intent);
return true;
}
}
return false;
}
});
private ScaleGestureDetector detectorZoom = new ScaleGestureDetector(getContext(), new ScaleGestureDetector.SimpleOnScaleGestureListener() {
@Override
public boolean onScale(ScaleGestureDetector detector) {
float scaleFactor = detector.getScaleFactor();
if (scaleFactor >= 1.1f) {
zoomIn();
return true;
} else if (scaleFactor <= 0.9) {
zoomOut();
return true;
}
return false;
}
});
public ChartView(Context context, boolean chartByDistance) {
super(context);
this.chartByDistance = chartByDistance;
@@ -226,16 +291,6 @@ public class ChartView extends View {
series[index].setEnabled(enabled);
}
/**
* Sets chart by distance.
* It is expected that after changing this value, data will be reloaded.
*
* @param value true for by distance, false for by time
*/
public void setChartByDistance(boolean value) {
chartByDistance = value;
}
/**
* Sets metric units.
*
@@ -414,79 +469,14 @@ public class ChartView extends View {
@Override
public boolean onTouchEvent(MotionEvent event) {
if (velocityTracker == null) {
velocityTracker = VelocityTracker.obtain();
}
velocityTracker.addMovement(event);
float x = event.getX();
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
// Stop the fling
if (!scroller.isFinished()) {
scroller.abortAnimation();
}
lastMotionEventX = x;
break;
case MotionEvent.ACTION_MOVE:
if (lastMotionEventX == -1) {
break;
}
// Scroll to follow the motion event
int deltaX = (int) (lastMotionEventX - x);
lastMotionEventX = x;
if (deltaX < 0) {
if (getScrollX() > 0) {
scrollBy(deltaX);
}
} else if (deltaX > 0) {
int availableToScroll = effectiveWidth * (zoomLevel - 1) - getScrollX();
if (availableToScroll > 0) {
scrollBy(Math.min(availableToScroll, deltaX));
}
}
break;
case MotionEvent.ACTION_UP:
// Check if the y event is within markerHeight of the marker center
if (Math.abs(event.getY() - topBorder - spacer - markerHeight / 2) < markerHeight) {
int minDistance = Integer.MAX_VALUE;
Waypoint nearestWaypoint = null;
synchronized (waypoints) {
for (int i = 0; i < waypoints.size(); i++) {
Waypoint waypoint = waypoints.get(i);
int distance = Math.abs(getX(getWaypointXValue(waypoint)) - (int) event.getX() - getScrollX());
if (distance < minDistance) {
minDistance = distance;
nearestWaypoint = waypoint;
}
}
}
if (nearestWaypoint != null && minDistance < markerWidth) {
Intent intent = IntentUtils.newIntent(getContext(), MarkerDetailActivity.class)
.putExtra(MarkerDetailActivity.EXTRA_MARKER_ID, nearestWaypoint.getId());
getContext().startActivity(intent);
return true;
}
}
VelocityTracker myVelocityTracker = velocityTracker;
myVelocityTracker.computeCurrentVelocity(1000);
int initialVelocity = (int) myVelocityTracker.getXVelocity();
if (Math.abs(initialVelocity) > ViewConfiguration.getMinimumFlingVelocity()) {
fling(-initialVelocity);
}
if (velocityTracker != null) {
velocityTracker.recycle();
velocityTracker = null;
}
break;
}
return true;
boolean isZoom = detectorZoom.onTouchEvent(event);
boolean isScrollTab = detectorScrollFlingTab.onTouchEvent(event);
return isZoom || isScrollTab;
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
updateEffectiveDimensionsIfChanged(
View.MeasureSpec.getSize(widthMeasureSpec), View.MeasureSpec.getSize(heightMeasureSpec));
updateEffectiveDimensionsIfChanged(View.MeasureSpec.getSize(widthMeasureSpec), View.MeasureSpec.getSize(heightMeasureSpec));
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
@@ -636,8 +626,7 @@ public class ChartView extends View {
private String getXAxisLabel() {
Context context = getContext();
if (chartByDistance) {
return metricUnits ? context.getString(R.string.unit_kilometer)
: context.getString(R.string.unit_mile);
return metricUnits ? context.getString(R.string.unit_kilometer) : context.getString(R.string.unit_mile);
} else {
return context.getString(R.string.description_time);
}
@@ -737,8 +726,7 @@ public class ChartView extends View {
* @param yValue the y value
* @return the marker width.
*/
private float drawYAxisMarker(
ChartValueSeries chartValueSeries, Canvas canvas, int xPosition, int yValue) {
private float drawYAxisMarker(ChartValueSeries chartValueSeries, Canvas canvas, int xPosition, int yValue) {
String marker = chartValueSeries.formatMarker(yValue);
Paint paint = chartValueSeries.getMarkerPaint();
Rect rect = getRect(paint, marker);
@@ -873,8 +861,7 @@ public class ChartView extends View {
topBorder = (int) (density * BORDER + titleDimensions[0] * (titleDimensions[1] + spacer));
Rect xAxisLabelRect = getRect(axisPaint, getXAxisLabel());
// border + x axis marker + spacer + .5 x axis label
bottomBorder = (int) (density * BORDER + getRect(xAxisMarkerPaint, "1").height() + spacer
+ (xAxisLabelRect.height() / 2));
bottomBorder = (int) (density * BORDER + getRect(xAxisMarkerPaint, "1").height() + spacer + (xAxisLabelRect.height() / 2));
rightBorder = (int) (density * BORDER + xAxisLabelRect.width() + spacer);
updateEffectiveDimensions();
}