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Merge pull request chenxiaolong#55 from chenxiaolong/chip-group
Use material3 chips instead of a button group for the output format selector
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140 changes: 140 additions & 0 deletions
140
app/src/main/java/com/chiller3/bcr/ChipGroupCentered.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,140 @@ | ||
| package com.chiller3.bcr | ||
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| import android.annotation.SuppressLint | ||
| import android.content.Context | ||
| import android.util.AttributeSet | ||
| import android.view.View | ||
| import androidx.core.view.ViewCompat | ||
| import com.google.android.material.chip.ChipGroup | ||
| import java.lang.Integer.max | ||
| import java.lang.Integer.min | ||
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| /** Hacky wrapper around [ChipGroup] to make every row individually centered. */ | ||
| class ChipGroupCentered(context: Context, attrs: AttributeSet?, defStyleAttr: Int) : | ||
| ChipGroup(context, attrs, defStyleAttr) { | ||
| private val _rowCountField = javaClass.superclass.superclass.getDeclaredField("rowCount") | ||
| private var rowCountField | ||
| get() = _rowCountField.getInt(this) | ||
| set(value) = _rowCountField.setInt(this, value) | ||
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| init { | ||
| _rowCountField.isAccessible = true | ||
| } | ||
|
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| constructor(context: Context, attrs: AttributeSet?) : | ||
| this(context, attrs, com.google.android.material.R.attr.chipGroupStyle) | ||
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| constructor(context: Context) : this(context, null) | ||
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| @SuppressLint("RestrictedApi") | ||
| override fun onLayout(sizeChanged: Boolean, left: Int, top: Int, right: Int, bottom: Int) { | ||
| if (isSingleLine) { | ||
| return super.onLayout(sizeChanged, left, top, right, bottom) | ||
| } | ||
|
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| val maxWidth = right - left - paddingRight - paddingLeft | ||
| var offsetTop = paddingTop | ||
| var rowStartIndex = 0 | ||
|
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| while (rowStartIndex < childCount) { | ||
| val (rowEndIndex, rowWidth, rowHeight) = getFittingRow(rowStartIndex, maxWidth) | ||
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| layoutRow( | ||
| rowStartIndex..rowEndIndex, | ||
| paddingLeft + (maxWidth - rowWidth) / 2, | ||
| offsetTop, | ||
| rowCountField, | ||
| ) | ||
|
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| offsetTop += rowHeight + lineSpacing | ||
| rowStartIndex = rowEndIndex + 1 | ||
| rowCountField += 1 | ||
| } | ||
| } | ||
|
|
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| /** | ||
| * Find the last index starting from [indexStart] that will fit in the row. | ||
| * | ||
| * @return (Index of last fitting element, width of row, height of row) | ||
| */ | ||
| @SuppressLint("RestrictedApi") | ||
| private fun getFittingRow(indexStart: Int, maxWidth: Int): Triple<Int, Int, Int> { | ||
| var indexEnd = indexStart | ||
| var childStart = 0 | ||
| var rowHeight = 0 | ||
|
|
||
| while (true) { | ||
| val child = getChildAt(indexEnd) | ||
| if (child.visibility == GONE) { | ||
| continue | ||
| } | ||
|
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| val (marginStart, marginEnd) = getMargins(child) | ||
| val childWidth = marginStart + child.measuredWidth + marginEnd | ||
| val separator = if (indexEnd > indexStart) { itemSpacing } else { 0 } | ||
|
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| // If even one child can't fit, force it to do so anyway | ||
| if (indexEnd != indexStart && childStart + separator + childWidth > maxWidth) { | ||
| --indexEnd | ||
| break | ||
| } | ||
|
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| childStart += separator + childWidth | ||
| rowHeight = max(rowHeight, child.measuredHeight) | ||
|
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| if (indexEnd == childCount - 1) { | ||
| break | ||
| } else { | ||
| ++indexEnd | ||
| } | ||
| } | ||
|
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| return Triple(indexEnd, min(childStart, maxWidth), rowHeight) | ||
| } | ||
|
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| /** | ||
| * Lay out [childIndices] children in a row positioned at [offsetLeft] and [offsetTop]. | ||
| */ | ||
| @SuppressLint("RestrictedApi") | ||
| private fun layoutRow(childIndices: IntRange, offsetLeft: Int, offsetTop: Int, rowIndex: Int) { | ||
| val range = if (layoutDirection == ViewCompat.LAYOUT_DIRECTION_RTL) { | ||
| childIndices.reversed() | ||
| } else { | ||
| childIndices | ||
| } | ||
| var childStart = offsetLeft | ||
|
|
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| for (i in range) { | ||
| val child = getChildAt(i) | ||
| if (child.visibility == GONE) { | ||
| child.setTag(com.google.android.material.R.id.row_index_key, -1) | ||
| continue | ||
| } else { | ||
| child.setTag(com.google.android.material.R.id.row_index_key, rowIndex) | ||
| } | ||
|
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| val (marginStart, marginEnd) = getMargins(child) | ||
|
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| child.layout( | ||
| childStart + marginStart, | ||
| offsetTop, | ||
| childStart + marginStart + child.measuredWidth, | ||
| offsetTop + child.measuredHeight, | ||
| ) | ||
|
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| childStart += marginStart + child.measuredWidth + marginEnd + itemSpacing | ||
| } | ||
| } | ||
|
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| companion object { | ||
| private fun getMargins(view: View): Pair<Int, Int> { | ||
| val lp = view.layoutParams | ||
|
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| return if (lp is MarginLayoutParams) { | ||
| Pair(lp.marginStart, lp.marginEnd) | ||
| } else { | ||
| Pair(0, 0) | ||
| } | ||
| } | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,5 @@ | ||
| <?xml version="1.0" encoding="utf-8"?> | ||
| <com.google.android.material.chip.Chip xmlns:android="http://schemas.android.com/apk/res/android" | ||
| style="@style/Widget.Material3.Chip.Filter" | ||
| android:layout_width="wrap_content" | ||
| android:layout_height="wrap_content" /> |