lecho.lib.hellocharts.gesture

Class ChartTouchHandler

java.lang.Object

lecho.lib.hellocharts.gesture.ChartTouchHandler

Direct Known Subclasses:

PieChartTouchHandler, PreviewChartTouchHandler

public class ChartTouchHandler
extends java.lang.Object

Default touch handler for most charts. Handles value touch, scroll, fling and zoom.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
protected class	ChartTouchHandler.ChartGestureListener
protected class	ChartTouchHandler.ChartScaleGestureListener

Field Summary

Fields

Modifier and Type	Field and Description
protected Chart	chart
protected ChartScroller	chartScroller
protected ChartZoomer	chartZoomer
protected ChartComputator	computator
protected ContainerScrollType	containerScrollType Type of scroll of container, horizontal or vertical.
protected android.view.GestureDetector	gestureDetector
protected boolean	isScrollEnabled
protected boolean	isValueSelectionEnabled
protected boolean	isValueTouchEnabled
protected boolean	isZoomEnabled
protected SelectedValue	oldSelectedValue
protected ChartRenderer	renderer
protected android.view.ScaleGestureDetector	scaleGestureDetector
protected SelectedValue	selectedValue
protected SelectedValue	selectionModeOldValue Used only for selection mode to avoid calling listener multiple times for the same selection.
protected android.view.ViewParent	viewParent ViewParent to disallow touch events interception if chart is within scroll container.

Constructor Summary

Constructors

Constructor and Description
ChartTouchHandler(android.content.Context context, Chart chart)

Method Summary

Modifier and Type	Method and Description
boolean	computeScroll() Computes scroll and zoom using ChartScroller and ChartZoomer.
ZoomType	getZoomType()
boolean	handleTouchEvent(android.view.MotionEvent event) Handle chart touch event(gestures, clicks).
boolean	handleTouchEvent(android.view.MotionEvent event, android.view.ViewParent viewParent, ContainerScrollType containerScrollType) Handle chart touch event(gestures, clicks).
boolean	isScrollEnabled()
boolean	isValueSelectionEnabled()
boolean	isValueTouchEnabled()
boolean	isZoomEnabled()
void	resetTouchHandler()
void	setScrollEnabled(boolean isScrollEnabled)
void	setValueSelectionEnabled(boolean isValueSelectionEnabled)
void	setValueTouchEnabled(boolean isValueTouchEnabled)
void	setZoomEnabled(boolean isZoomEnabled)
void	setZoomType(ZoomType zoomType)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

gestureDetector

protected android.view.GestureDetector gestureDetector

scaleGestureDetector

protected android.view.ScaleGestureDetector scaleGestureDetector

chartScroller

protected ChartScroller chartScroller

chartZoomer

protected ChartZoomer chartZoomer

chart

protected Chart chart

computator

protected ChartComputator computator

renderer

protected ChartRenderer renderer

isZoomEnabled

protected boolean isZoomEnabled

isScrollEnabled

protected boolean isScrollEnabled

isValueTouchEnabled

protected boolean isValueTouchEnabled

isValueSelectionEnabled

protected boolean isValueSelectionEnabled

selectionModeOldValue

protected SelectedValue selectionModeOldValue

Used only for selection mode to avoid calling listener multiple times for the same selection. Small thing but it is more intuitive this way.

selectedValue

protected SelectedValue selectedValue

oldSelectedValue

protected SelectedValue oldSelectedValue

viewParent

protected android.view.ViewParent viewParent

ViewParent to disallow touch events interception if chart is within scroll container.

containerScrollType

protected ContainerScrollType containerScrollType

Type of scroll of container, horizontal or vertical.

Constructor Detail

ChartTouchHandler

public ChartTouchHandler(android.content.Context context,
                         Chart chart)

Method Detail

resetTouchHandler

public void resetTouchHandler()

computeScroll

public boolean computeScroll()

Computes scroll and zoom using ChartScroller and ChartZoomer. This method returns true if scroll/zoom was computed and chart needs to be invalidated.

handleTouchEvent

public boolean handleTouchEvent(android.view.MotionEvent event)

Handle chart touch event(gestures, clicks). Return true if gesture was handled and chart needs to be invalidated.

handleTouchEvent

public boolean handleTouchEvent(android.view.MotionEvent event,
                                android.view.ViewParent viewParent,
                                ContainerScrollType containerScrollType)

Handle chart touch event(gestures, clicks). Return true if gesture was handled and chart needs to be invalidated. If viewParent and containerScrollType are not null chart can be scrolled and scaled within horizontal or vertical scroll container like ViewPager.

isZoomEnabled

public boolean isZoomEnabled()

setZoomEnabled

public void setZoomEnabled(boolean isZoomEnabled)

isScrollEnabled

public boolean isScrollEnabled()

setScrollEnabled

public void setScrollEnabled(boolean isScrollEnabled)

getZoomType

public ZoomType getZoomType()

setZoomType

public void setZoomType(ZoomType zoomType)

isValueTouchEnabled

public boolean isValueTouchEnabled()

setValueTouchEnabled

public void setValueTouchEnabled(boolean isValueTouchEnabled)

isValueSelectionEnabled

public boolean isValueSelectionEnabled()

setValueSelectionEnabled

public void setValueSelectionEnabled(boolean isValueSelectionEnabled)