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workspace: Make computeLayout() return a layout object

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Start cleaning up the whole mess around the layout object a bit and
return a new object in the LayoutStrategies computeLayout()
implementation. This object is supposed to be opaque to the API user and
will only be passed to the layout strategy.

For now, keep setting a few things on that object from outside, we'll
clean that up later.

Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1617>
This commit is contained in:
Jonas Dreßler 2021-02-01 11:07:33 +01:00 committed by Marge Bot
parent ac7dc62da6
commit 8d9a92fe98
1 changed files with 31 additions and 20 deletions
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51
js/ui/workspace.js
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@ -114,16 +114,11 @@ var LayoutStrategy = class {
this._columnSpacing = params.columnSpacing;
}
// Compute strategy-specific window slots for each window in
// @windows, given the @layout. The strategy may also use @layout
// as strategy-specific storage.
// Compute a strategy-specific overall layout given a list of WindowPreviews
// @windows and the strategy-specific @layoutParams.
//
// This must calculate:
// * maxColumns - The maximum number of columns used by the layout.
// * gridWidth - The total width used by the grid, unscaled, unspaced.
// * gridHeight - The totial height used by the grid, unscaled, unspaced.
// * rows - A list of rows, which should be instantiated by _newRow.
computeLayout(_windows, _layout) {
// Returns a strategy-specific layout object that is opaque to the user.
computeLayout(_windows, _layoutParams) {
throw new GObject.NotImplementedError(`computeLayout in ${this.constructor.name}`);
}
@ -210,8 +205,15 @@ var UnalignedLayoutStrategy = class extends LayoutStrategy {
row.windows.sort((a, b) => a.windowCenter.x - b.windowCenter.x);
}
computeLayout(windows, layout) {
let numRows = layout.numRows;
computeLayout(windows, layoutParams) {
layoutParams = Params.parse(layoutParams, {
numRows: 0,
});
if (layoutParams.numRows === 0)
throw new Error(`${this.constructor.name}: No numRows given in layout params`);
const numRows = layoutParams.numRows;
let rows = [];
let totalWidth = 0;
@ -261,10 +263,13 @@ var UnalignedLayoutStrategy = class extends LayoutStrategy {
gridHeight += row.fullHeight;
}
layout.rows = rows;
layout.maxColumns = maxRow.windows.length;
layout.gridWidth = maxRow.fullWidth;
layout.gridHeight = gridHeight;
return {
numRows,
rows,
maxColumns: maxRow.windows.length,
gridWidth: maxRow.fullWidth,
gridHeight,
};
}
computeScaleAndSpace(layout) {
@ -491,25 +496,31 @@ var WorkspaceLayout = GObject.registerClass({
columnSpacing,
});
let lastLayout = {};
let lastLayout = null;
let lastNumColumns = -1;
for (let numRows = 1; ; numRows++) {
let numColumns = Math.ceil(this._sortedWindows.length / numRows);
const numColumns = Math.ceil(this._sortedWindows.length / numRows);
// If adding a new row does not change column count just stop
// (for instance: 9 windows, with 3 rows -> 3 columns, 4 rows ->
// 3 columns as well => just use 3 rows then)
if (numColumns === lastLayout.numColumns)
if (numColumns === lastNumColumns)
break;
let layout = { area, strategy, numRows, numColumns };
strategy.computeLayout(this._sortedWindows, layout);
const layout = strategy.computeLayout(this._sortedWindows, {
numRows,
});
layout.area = area;
layout.strategy = strategy;
strategy.computeScaleAndSpace(layout);
if (!this._isBetterLayout(lastLayout, layout))
break;
lastLayout = layout;
lastNumColumns = numColumns;
}
return lastLayout;