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Add extensions function to apply draggable behaviour to any View
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draggableviewlib/src/main/java/io/github/hyuwah/draggableviewlib/Constants.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,13 @@ | ||
| package io.github.hyuwah.draggableviewlib | ||
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| object Constants { | ||
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| enum class STICKY { | ||
| NONE, | ||
| AXIS_X, | ||
| AXIS_Y, | ||
| AXIS_XY | ||
| } | ||
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| const val DRAG_TOLERANCE = 16 | ||
| } |
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111 changes: 111 additions & 0 deletions
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draggableviewlib/src/main/java/io/github/hyuwah/draggableviewlib/Extensions.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,111 @@ | ||
| package io.github.hyuwah.draggableviewlib | ||
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| import android.view.MotionEvent | ||
| import android.view.View | ||
| import io.github.hyuwah.draggableviewlib.Constants.DRAG_TOLERANCE | ||
| import java.lang.Math.max | ||
| import kotlin.math.abs | ||
| import kotlin.math.min | ||
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| fun View.makeDraggable( | ||
| stickyAxis: Constants.STICKY = Constants.STICKY.NONE, | ||
| animated: Boolean = true | ||
| ) { | ||
| var widgetInitialX = 0f | ||
| var widgetDX = 0f | ||
| var widgetInitialY = 0f | ||
| var widgetDY = 0f | ||
| setOnTouchListener { v, event -> | ||
| val viewParent = v.parent as View | ||
| val PARENT_HEIGHT = viewParent.height | ||
| val PARENT_WIDTH = viewParent.width | ||
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| when (event.actionMasked) { | ||
| MotionEvent.ACTION_DOWN -> { | ||
| widgetDX = v.x - event.rawX | ||
| widgetDY = v.y - event.rawY | ||
| widgetInitialX = v.x | ||
| widgetInitialY = v.y | ||
| } | ||
| MotionEvent.ACTION_MOVE -> { | ||
| var newX = event.rawX + widgetDX | ||
| newX = max(0F, newX) | ||
| newX = min((PARENT_WIDTH - v.width).toFloat(), newX) | ||
| v.x = newX | ||
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| var newY = event.rawY + widgetDY | ||
| newY = max(0F, newY) | ||
| newY = min((PARENT_HEIGHT - v.height).toFloat(), newY) | ||
| v.y = newY | ||
| } | ||
| MotionEvent.ACTION_UP -> { | ||
| when (stickyAxis) { | ||
| Constants.STICKY.AXIS_X -> { | ||
| if (event.rawX >= PARENT_WIDTH / 2) { | ||
| if (animated) | ||
| v.animate().x((PARENT_WIDTH) - (v.width).toFloat()).setDuration(250).start() | ||
| else | ||
| v.x = (PARENT_WIDTH) - (v.width).toFloat() | ||
| } else { | ||
| if (animated) | ||
| v.animate().x(0F).setDuration(250).start() | ||
| else | ||
| v.x = 0F | ||
| } | ||
| } | ||
| Constants.STICKY.AXIS_Y -> { | ||
| if (event.rawY >= PARENT_HEIGHT / 2) { | ||
| if (animated) | ||
| v.animate().y((PARENT_HEIGHT) - (v.height).toFloat()).setDuration( | ||
| 250 | ||
| ).start() | ||
| else | ||
| v.y = (PARENT_HEIGHT) - (v.height).toFloat() | ||
| } else { | ||
| if (animated) | ||
| v.animate().y(0F).setDuration(250).start() | ||
| else { | ||
| if (animated) | ||
| v.animate().y(0F).setDuration(250).start() | ||
| else | ||
| v.y = 0F | ||
| } | ||
| } | ||
| } | ||
| Constants.STICKY.AXIS_XY -> { | ||
| if (event.rawX >= PARENT_WIDTH / 2) { | ||
| if (animated) | ||
| v.animate().x((PARENT_WIDTH) - (v.width).toFloat()).setDuration(250).start() | ||
| else | ||
| v.x = (PARENT_WIDTH) - (v.width).toFloat() | ||
| } else { | ||
| if (animated) | ||
| v.animate().x(0F).setDuration(250).start() | ||
| v.x = 0F | ||
| } | ||
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| if (event.rawY >= PARENT_HEIGHT / 2) { | ||
| if (animated) | ||
| v.animate().y((PARENT_HEIGHT) - (v.height).toFloat()).setDuration( | ||
| 250 | ||
| ).start() | ||
| else | ||
| v.y = (PARENT_HEIGHT) - (v.height).toFloat() | ||
| } else { | ||
| if (animated) | ||
| v.animate().y(0F).setDuration(250).start() | ||
| else | ||
| v.y = 0F | ||
| } | ||
| } | ||
| } | ||
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| if (abs(v.x - widgetInitialX) <= DRAG_TOLERANCE && abs(v.y - widgetInitialY) <= DRAG_TOLERANCE) { | ||
| performClick() | ||
| } | ||
| } | ||
| else -> return@setOnTouchListener false | ||
| } | ||
| true | ||
| } | ||
| } |
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