Support for weights in GridLayout (87260844) · Commits · e / os / android_frameworks_base

api/current.txt

+6 −0

Original line number	Diff line number	Diff line
		@@ -749,6 +749,7 @@ package android {
		field public static final int layout_centerVertical = 16843153; // 0x1010191
		field public static final int layout_column = 16843084; // 0x101014c
		field public static final int layout_columnSpan = 16843645; // 0x101037d
		field public static final int layout_columnWeight = 16843868; // 0x101045c
		field public static final int layout_gravity = 16842931; // 0x10100b3
		field public static final int layout_height = 16842997; // 0x10100f5
		field public static final int layout_margin = 16842998; // 0x10100f6
		@@ -760,6 +761,7 @@ package android {
		field public static final int layout_marginTop = 16843000; // 0x10100f8
		field public static final int layout_row = 16843643; // 0x101037b
		field public static final int layout_rowSpan = 16843644; // 0x101037c
		field public static final int layout_rowWeight = 16843867; // 0x101045b
		field public static final int layout_scale = 16843155; // 0x1010193
		field public static final int layout_span = 16843085; // 0x101014d
		field public static final int layout_toEndOf = 16843704; // 0x10103b8
		@@ -36565,6 +36567,10 @@ package android.widget {
		method public void setRowCount(int);
		method public void setRowOrderPreserved(boolean);
		method public void setUseDefaultMargins(boolean);
		method public static android.widget.GridLayout.Spec spec(int, int, android.widget.GridLayout.Alignment, float);
		method public static android.widget.GridLayout.Spec spec(int, android.widget.GridLayout.Alignment, float);
		method public static android.widget.GridLayout.Spec spec(int, int, float);
		method public static android.widget.GridLayout.Spec spec(int, float);
		method public static android.widget.GridLayout.Spec spec(int, int, android.widget.GridLayout.Alignment);
		method public static android.widget.GridLayout.Spec spec(int, android.widget.GridLayout.Alignment);
		method public static android.widget.GridLayout.Spec spec(int, int);

core/java/android/widget/GridLayout.java

+176 −33

Original line number	Diff line number	Diff line
		@@ -104,14 +104,16 @@ import static java.lang.Math.min;
		*
		* <h4>Excess Space Distribution</h4>
		*
		* GridLayout's distribution of excess space is based on <em>priority</em>
		* rather than <em>weight</em>.
		* As of API 21, GridLayout's distribution of excess space accomodates the principle of weight.
		* In the event that no weights are specified, the previous conventions are respected and
		* columns and rows are taken as flexible if their views specify some form of alignment
		* within their groups.
		* <p>
		* A child's ability to stretch is inferred from the alignment properties of
		* its row and column groups (which are typically set by setting the
		* {@link LayoutParams#setGravity(int) gravity} property of the child's layout parameters).
		* If alignment was defined along a given axis then the component
		* is taken as <em>flexible</em> in that direction. If no alignment was set,
		* The flexibility of a view is therefore influenced by its alignment which is,
		* in turn, typically defined by setting the
		* {@link LayoutParams#setGravity(int) gravity} property of the child's layout parameters.
		* If either a weight or alignment were defined along a given axis then the component
		* is taken as <em>flexible</em> in that direction. If no weight or alignment was set,
		* the component is instead assumed to be <em>inflexible</em>.
		* <p>
		* Multiple components in the same row or column group are
		@@ -122,12 +124,16 @@ import static java.lang.Math.min;
		* elements is flexible if <em>one</em> of its elements is flexible.
		* <p>
		* To make a column stretch, make sure all of the components inside it define a
		* gravity. To prevent a column from stretching, ensure that one of the components
		* in the column does not define a gravity.
		* weight or a gravity. To prevent a column from stretching, ensure that one of the components
		* in the column does not define a weight or a gravity.
		* <p>
		* When the principle of flexibility does not provide complete disambiguation,
		* GridLayout's algorithms favour rows and columns that are closer to its <em>right</em>
		* and <em>bottom</em> edges.
		* and <em>bottom</em> edges. To be more precise, GridLayout treats each of its layout
		* parameters as a constraint in the a set of variables that define the grid-lines along a
		* given axis. During layout, GridLayout solves the constraints so as to return the unique
		* solution to those constraints for which all variables are less-than-or-equal-to
		* the corresponding value in any other valid solution.
		*
		* <h4>Interpretation of GONE</h4>
		*
		@@ -140,18 +146,6 @@ import static java.lang.Math.min;
		* had never been added to it.
		* These statements apply equally to rows as well as columns, and to groups of rows or columns.
		*
		* <h5>Limitations</h5>
		*
		* GridLayout does not provide support for the principle of <em>weight</em>, as defined in
		* {@link LinearLayout.LayoutParams#weight}. In general, it is not therefore possible
		* to configure a GridLayout to distribute excess space between multiple components.
		* <p>
		* Some common use-cases may nevertheless be accommodated as follows.
		* To place equal amounts of space around a component in a cell group;
		* use {@link #CENTER} alignment (or {@link LayoutParams#setGravity(int) gravity}).
		* For complete control over excess space distribution in a row or column;
		* use a {@link LinearLayout} subview to hold the components in the associated cell group.
		* When using either of these techniques, bear in mind that cell groups may be defined to overlap.
		* <p>
		* See {@link GridLayout.LayoutParams} for a full description of the
		* layout parameters used by GridLayout.
		@@ -1693,8 +1687,74 @@ public class GridLayout extends ViewGroup {
		return trailingMargins;
		}

		private void computeLocations(int[] a) {
		private void solve(int[] a) {
		solve(getArcs(), a);
		}

		private void resetDeltas() {
		Bounds[] values = getGroupBounds().values;
		for (int i = 0, N = values.length; i < N; i++) {
		values[i].shareOfDelta = 0;
		}
		}

		private boolean requiresWeightDistribution() {
		Bounds[] values = getGroupBounds().values;
		for (int i = 0, N = values.length; i < N; i++) {
		if (values[i].weight != 0) {
		return true;
		}
		}
		return false;
		}

		private void shareOutDelta(int[] locations) {
		PackedMap<Spec, Bounds> groupBounds = getGroupBounds();
		Spec[] specs = groupBounds.keys;
		Bounds[] bounds = groupBounds.values;
		int totalDelta = 0;
		float totalWeight = 0;
		final int N = bounds.length;

		for (int i = 0; i < N; i++) {
		Spec spec = specs[i];
		Bounds bound = bounds[i];
		if (bound.weight != 0) {
		int minSize = bound.size(true);
		Interval span = spec.span;
		int actualSize = locations[span.max] - locations[span.min];
		int delta = actualSize - minSize;
		totalDelta += delta;
		totalWeight += bound.weight;
		}
		}
		for (int i = 0; i < N; i++) {
		Bounds bound = bounds[i];
		float weight = bound.weight;
		if (weight != 0) {
		int delta = Math.round((weight * totalDelta / totalWeight));
		bound.shareOfDelta = delta;
		// the two adjustments below compensate for the rounding above
		totalDelta -= delta;
		totalWeight -= weight;
		}
		}
		}

		private void solveAndDistributeSpace(int[] a) {
		resetDeltas();
		solve(a);
		if (requiresWeightDistribution()) {
		shareOutDelta(a);
		arcsValid = false;
		forwardLinksValid = false;
		backwardLinksValid = false;
		solve(a);
		}
		}

		private void computeLocations(int[] a) {
		solveAndDistributeSpace(a);
		if (!orderPreserved) {
		// Solve returns the smallest solution to the constraint system for which all
		// values are positive. One value is therefore zero - though if the row/col
		@@ -1810,6 +1870,23 @@ public class GridLayout extends ViewGroup {
		* both aspects of alignment within the cell group. It is also possible to specify a child's
		* alignment within its cell group by using the {@link GridLayout.LayoutParams#setGravity(int)}
		* method.
		* <p>
		* The weight property is also included in Spec and specifies the proportion of any
		* excess space that is due to the enclosing row or column.
		* GridLayout's model of flexibility and weight is broadly based on the physical properties of
		* systems of mechanical springs. For example, a column in a GridLayout is modeled as
		* if a set of springs were attached in parallel at their ends. Columns are therefore
		* flexible only if and only if all views inside them are flexible. Similarly, the combined
		* weight of a column is defined as the <em>minimum</em> of the weights of the components it
		* contains. So, if any one component in a column of components has a weight of zero,
		* the entire group has a weight of zero and will not receive any of the
		* excess space that GridLayout distributes in its second
		* (internal) layout pass. The default weight of a component is zero,
		* reflecting inflexibility, but the default weight of a column (with nothing in it)
		* is effectively infinite, reflecting the fact that a parallel group of
		* springs is infinitely flexible when it contains no springs.
		* <p>
		* The above comments apply equally to rows and groups of rows and columns.
		*
		* <h4>WRAP_CONTENT and MATCH_PARENT</h4>
		*
		@@ -1851,9 +1928,11 @@ public class GridLayout extends ViewGroup {
		* <li>{@link #rowSpec}<code>.row</code> = {@link #UNDEFINED} </li>
		* <li>{@link #rowSpec}<code>.rowSpan</code> = 1 </li>
		* <li>{@link #rowSpec}<code>.alignment</code> = {@link #BASELINE} </li>
		* <li>{@link #rowSpec}<code>.weight</code> = 0 </li>
		* <li>{@link #columnSpec}<code>.column</code> = {@link #UNDEFINED} </li>
		* <li>{@link #columnSpec}<code>.columnSpan</code> = 1 </li>
		* <li>{@link #columnSpec}<code>.alignment</code> = {@link #START} </li>
		* <li>{@link #columnSpec}<code>.weight</code> = 0 </li>
		* </ul>
		*
		* See {@link GridLayout} for a more complete description of the conventions
		@@ -1861,8 +1940,10 @@ public class GridLayout extends ViewGroup {
		*
		* @attr ref android.R.styleable#GridLayout_Layout_layout_row
		* @attr ref android.R.styleable#GridLayout_Layout_layout_rowSpan
		* @attr ref android.R.styleable#GridLayout_Layout_layout_rowWeight
		* @attr ref android.R.styleable#GridLayout_Layout_layout_column
		* @attr ref android.R.styleable#GridLayout_Layout_layout_columnSpan
		* @attr ref android.R.styleable#GridLayout_Layout_layout_columnWeight
		* @attr ref android.R.styleable#GridLayout_Layout_layout_gravity
		*/
		public static class LayoutParams extends MarginLayoutParams {
		@@ -1889,9 +1970,11 @@ public class GridLayout extends ViewGroup {

		private static final int COLUMN = R.styleable.GridLayout_Layout_layout_column;
		private static final int COLUMN_SPAN = R.styleable.GridLayout_Layout_layout_columnSpan;
		private static final int COLUMN_WEIGHT = R.styleable.GridLayout_Layout_layout_columnWeight;

		private static final int ROW = R.styleable.GridLayout_Layout_layout_row;
		private static final int ROW_SPAN = R.styleable.GridLayout_Layout_layout_rowSpan;
		private static final int ROW_WEIGHT = R.styleable.GridLayout_Layout_layout_rowWeight;

		private static final int GRAVITY = R.styleable.GridLayout_Layout_layout_gravity;

		@@ -2034,11 +2117,13 @@ public class GridLayout extends ViewGroup {

		int column = a.getInt(COLUMN, DEFAULT_COLUMN);
		int colSpan = a.getInt(COLUMN_SPAN, DEFAULT_SPAN_SIZE);
		this.columnSpec = spec(column, colSpan, getAlignment(gravity, true));
		float colWeight = a.getFloat(COLUMN_WEIGHT, Spec.DEFAULT_WEIGHT);
		this.columnSpec = spec(column, colSpan, getAlignment(gravity, true), colWeight);

		int row = a.getInt(ROW, DEFAULT_ROW);
		int rowSpan = a.getInt(ROW_SPAN, DEFAULT_SPAN_SIZE);
		this.rowSpec = spec(row, rowSpan, getAlignment(gravity, false));
		float rowWeight = a.getFloat(ROW_WEIGHT, Spec.DEFAULT_WEIGHT);
		this.rowSpec = spec(row, rowSpan, getAlignment(gravity, false), rowWeight);
		} finally {
		a.recycle();
		}
		@@ -2244,6 +2329,8 @@ public class GridLayout extends ViewGroup {
		public int before;
		public int after;
		public int flexibility; // we're flexible iff all included specs are flexible
		public float weight; // the min of the weights of the individual specs
		public int shareOfDelta;

		private Bounds() {
		reset();
		@@ -2253,6 +2340,7 @@ public class GridLayout extends ViewGroup {
		before = Integer.MIN_VALUE;
		after = Integer.MIN_VALUE;
		flexibility = CAN_STRETCH; // from the above, we're flexible when empty
		weight = Float.MAX_VALUE; // default is large => row/cols take all slack when empty
		}

		protected void include(int before, int after) {
		@@ -2266,7 +2354,7 @@ public class GridLayout extends ViewGroup {
		return MAX_SIZE;
		}
		}
		return before + after;
		return before + after + shareOfDelta;
		}

		protected int getOffset(GridLayout gl, View c, Alignment a, int size, boolean horizontal) {
		@@ -2275,6 +2363,7 @@ public class GridLayout extends ViewGroup {

		protected final void include(GridLayout gl, View c, Spec spec, Axis axis) {
		this.flexibility &= spec.getFlexibility();
		weight = Math.min(weight, spec.weight);
		boolean horizontal = axis.horizontal;
		int size = gl.getMeasurementIncludingMargin(c, horizontal);
		Alignment alignment = gl.getAlignment(spec.alignment, horizontal);
		@@ -2401,36 +2490,43 @@ public class GridLayout extends ViewGroup {
		* <li>{@link #spec(int, int)}</li>
		* <li>{@link #spec(int, Alignment)}</li>
		* <li>{@link #spec(int, int, Alignment)}</li>
		* <li>{@link #spec(int, float)}</li>
		* <li>{@link #spec(int, int, float)}</li>
		* <li>{@link #spec(int, Alignment, float)}</li>
		* <li>{@link #spec(int, int, Alignment, float)}</li>
		* </ul>
		*
		*/
		public static class Spec {
		static final Spec UNDEFINED = spec(GridLayout.UNDEFINED);
		static final float DEFAULT_WEIGHT = 0;

		final boolean startDefined;
		final Interval span;
		final Alignment alignment;
		final float weight;

		private Spec(boolean startDefined, Interval span, Alignment alignment) {
		private Spec(boolean startDefined, Interval span, Alignment alignment, float weight) {
		this.startDefined = startDefined;
		this.span = span;
		this.alignment = alignment;
		this.weight = weight;
		}

		private Spec(boolean startDefined, int start, int size, Alignment alignment) {
		this(startDefined, new Interval(start, start + size), alignment);
		private Spec(boolean startDefined, int start, int size, Alignment alignment, float weight) {
		this(startDefined, new Interval(start, start + size), alignment, weight);
		}

		final Spec copyWriteSpan(Interval span) {
		return new Spec(startDefined, span, alignment);
		return new Spec(startDefined, span, alignment, weight);
		}

		final Spec copyWriteAlignment(Alignment alignment) {
		return new Spec(startDefined, span, alignment);
		return new Spec(startDefined, span, alignment, weight);
		}

		final int getFlexibility() {
		return (alignment == UNDEFINED_ALIGNMENT) ? INFLEXIBLE : CAN_STRETCH;
		return (alignment == UNDEFINED_ALIGNMENT && weight == 0) ? INFLEXIBLE : CAN_STRETCH;
		}

		/**
		@@ -2478,6 +2574,7 @@ public class GridLayout extends ViewGroup {
		* <ul>
		* <li> {@code spec.span = [start, start + size]} </li>
		* <li> {@code spec.alignment = alignment} </li>
		* <li> {@code spec.weight = weight} </li>
		* </ul>
		* <p>
		* To leave the start index undefined, use the value {@link #UNDEFINED}.
		@@ -2485,9 +2582,55 @@ public class GridLayout extends ViewGroup {
		* @param start the start
		* @param size the size
		* @param alignment the alignment
		* @param weight the weight
		*/
		public static Spec spec(int start, int size, Alignment alignment, float weight) {
		return new Spec(start != UNDEFINED, start, size, alignment, weight);
		}

		/**
		* Equivalent to: {@code spec(start, 1, alignment, weight)}.
		*
		* @param start the start
		* @param alignment the alignment
		* @param weight the weight
		*/
		public static Spec spec(int start, Alignment alignment, float weight) {
		return spec(start, 1, alignment, weight);
		}

		/**
		* Equivalent to: {@code spec(start, 1, default_alignment, weight)} -
		* where {@code default_alignment} is specified in
		* {@link android.widget.GridLayout.LayoutParams}.
		*
		* @param start the start
		* @param size the size
		* @param weight the weight
		*/
		public static Spec spec(int start, int size, float weight) {
		return spec(start, size, UNDEFINED_ALIGNMENT, weight);
		}

		/**
		* Equivalent to: {@code spec(start, 1, weight)}.
		*
		* @param start the start
		* @param weight the weight
		*/
		public static Spec spec(int start, float weight) {
		return spec(start, 1, weight);
		}

		/**
		* Equivalent to: {@code spec(start, size, alignment, 0f)}.
		*
		* @param start the start
		* @param size the size
		* @param alignment the alignment
		*/
		public static Spec spec(int start, int size, Alignment alignment) {
		return new Spec(start != UNDEFINED, start, size, alignment);
		return spec(start, size, alignment, Spec.DEFAULT_WEIGHT);
		}

		/**

core/res/res/values/attrs.xml

+6 −0

Original line number	Diff line number	Diff line
		@@ -4057,6 +4057,9 @@
		The default is one.
		See {@link android.widget.GridLayout.Spec}. -->
		<attr name="layout_rowSpan" format="integer" min="1" />
		<!-- The relative proportion of horizontal space that should be allocated to this view
		during excess space distribution. -->
		<attr name="layout_rowWeight" format="float" />
		<!-- The column boundary delimiting the left of the group of cells
		occupied by this view. -->
		<attr name="layout_column" />
		@@ -4065,6 +4068,9 @@
		The default is one.
		See {@link android.widget.GridLayout.Spec}. -->
		<attr name="layout_columnSpan" format="integer" min="1" />
		<!-- The relative proportion of vertical space that should be allocated to this view
		during excess space distribution. -->
		<attr name="layout_columnWeight" format="float" />
		<!-- Gravity specifies how a component should be placed in its group of cells.
		The default is LEFT \| BASELINE.
		See {@link android.widget.GridLayout.LayoutParams#setGravity(int)}. -->

core/res/res/values/public.xml

+2 −0

Original line number	Diff line number	Diff line
		@@ -2178,6 +2178,8 @@
		<public type="attr" name="contentInsetLeft" />
		<public type="attr" name="contentInsetRight" />
		<public type="attr" name="paddingMode" />
		<public type="attr" name="layout_rowWeight" />
		<public type="attr" name="layout_columnWeight" />

		<public-padding type="dimen" name="l_resource_pad" end="0x01050010" />