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* Versions * Add TRANSFORMATION_GRAVITY_AUTO * Create Alignment class * Create Alignment attrs and update Views * Implement Alignment in checkPanBounds * Update docs * Remove checks to be consistent with docs * Rename methods and fields * Fix fling with Alignment.NONE * Address review, move gravity logic to Alignment * Improve #79
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128
library/src/main/java/com/otaliastudios/zoom/Alignment.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,128 @@ | ||
| package com.otaliastudios.zoom | ||
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| import android.annotation.SuppressLint | ||
| import android.view.Gravity | ||
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| /** | ||
| * Holds constants for [ZoomApi.setAlignment]. | ||
| */ | ||
| object Alignment { | ||
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| // Will use one hexadecimal value for each axis, so 16 possible values. | ||
| internal const val MASK = 0xF0 // 1111 0000 | ||
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| // A special value meaning that the flag for some axis was not set. | ||
| internal const val NO_VALUE = 0x0 | ||
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| // Vertical | ||
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| /** | ||
| * Aligns top side of the content to the top side of the container. | ||
| */ | ||
| const val TOP = 0x01 // 0000 0001 | ||
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| /** | ||
| * Aligns the bottom side of the content to the bottom side of the container. | ||
| */ | ||
| const val BOTTOM = 0x02 // 0000 0010 | ||
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| /** | ||
| * Centers the content vertically inside the container. | ||
| */ | ||
| const val CENTER_VERTICAL = 0x03 // 0000 0011 | ||
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| /** | ||
| * No forced alignment on the vertical axis. | ||
| */ | ||
| const val NONE_VERTICAL = 0x04 // 0000 0100 | ||
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| // Horizontal | ||
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| /** | ||
| * Aligns left side of the content to the left side of the container. | ||
| */ | ||
| const val LEFT = 0x10 // 0001 0000 | ||
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| /** | ||
| * Aligns right side of the content to the right side of the container. | ||
| */ | ||
| const val RIGHT = 0x20 // 0010 0000 | ||
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| /** | ||
| * Centers the content horizontally inside the container. | ||
| */ | ||
| const val CENTER_HORIZONTAL = 0x30 // 0011 0000 | ||
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| /** | ||
| * No forced alignment on the horizontal axis. | ||
| */ | ||
| const val NONE_HORIZONTAL = 0x40 // 0100 0000 | ||
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| // TODO support START and END | ||
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| /** | ||
| * Shorthand for [CENTER_HORIZONTAL] and [CENTER_VERTICAL] together. | ||
| */ | ||
| const val CENTER = CENTER_VERTICAL or CENTER_HORIZONTAL | ||
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| /** | ||
| * Shorthand for [NONE_HORIZONTAL] and [NONE_VERTICAL] together. | ||
| */ | ||
| const val NONE = NONE_VERTICAL or NONE_HORIZONTAL | ||
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| /** | ||
| * Returns the horizontal alignment for this alignment, | ||
| * or [NO_VALUE] if no value was set. | ||
| */ | ||
| internal fun getHorizontal(alignment: Int): Int { | ||
| return alignment and MASK | ||
| } | ||
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| /** | ||
| * Returns the vertical alignment for this alignment, | ||
| * or [NO_VALUE] if no value was set. | ||
| */ | ||
| internal fun getVertical(alignment: Int): Int { | ||
| return alignment and MASK.inv() | ||
| } | ||
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| /** | ||
| * Returns whether this alignment is of 'none' type. | ||
| * In case [alignment] includes both axes, both are required to be 'none' or [NO_VALUE]. | ||
| */ | ||
| internal fun isNone(alignment: Int): Boolean { | ||
| return alignment == Alignment.NONE | ||
| || alignment == Alignment.NO_VALUE | ||
| || alignment == Alignment.NONE_HORIZONTAL | ||
| || alignment == Alignment.NONE_VERTICAL | ||
| } | ||
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| /** | ||
| * Transforms this alignment to a horizontal gravity value. | ||
| */ | ||
| @SuppressLint("RtlHardcoded") | ||
| internal fun toHorizontalGravity(alignment: Int, valueIfNone: Int): Int { | ||
| val horizontalAlignment = getHorizontal(alignment) | ||
| return when (horizontalAlignment) { | ||
| Alignment.LEFT -> Gravity.LEFT | ||
| Alignment.RIGHT -> Gravity.RIGHT | ||
| Alignment.CENTER_HORIZONTAL -> Gravity.CENTER_HORIZONTAL | ||
| Alignment.NONE_HORIZONTAL -> valueIfNone | ||
| else -> valueIfNone | ||
| } | ||
| } | ||
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| /** | ||
| * Transforms this alignment to a vertical gravity value. | ||
| */ | ||
| internal fun toVerticalGravity(alignment: Int, valueIfNone: Int): Int { | ||
| val verticalAlignment = getHorizontal(alignment) | ||
| return when (verticalAlignment) { | ||
| Alignment.TOP -> Gravity.TOP | ||
| Alignment.BOTTOM -> Gravity.BOTTOM | ||
| Alignment.CENTER_VERTICAL -> Gravity.CENTER_VERTICAL | ||
| Alignment.NONE_VERTICAL -> valueIfNone | ||
| else -> valueIfNone | ||
| } | ||
| } | ||
| } |
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