diff options
Diffstat (limited to 'eclipse/plugins/com.android.ide.eclipse.adt/src/com/android/ide/common/layout/GridLayoutRule.java')
| -rw-r--r-- | eclipse/plugins/com.android.ide.eclipse.adt/src/com/android/ide/common/layout/GridLayoutRule.java | 676 |
1 files changed, 0 insertions, 676 deletions
diff --git a/eclipse/plugins/com.android.ide.eclipse.adt/src/com/android/ide/common/layout/GridLayoutRule.java b/eclipse/plugins/com.android.ide.eclipse.adt/src/com/android/ide/common/layout/GridLayoutRule.java deleted file mode 100644 index 80a23c6db..000000000 --- a/eclipse/plugins/com.android.ide.eclipse.adt/src/com/android/ide/common/layout/GridLayoutRule.java +++ /dev/null @@ -1,676 +0,0 @@ -/* - * Copyright (C) 2011 The Android Open Source Project - * - * Licensed under the Eclipse Public License, Version 1.0 (the "License"); - * you may not use this file except in compliance with the License. - * You may obtain a copy of the License at - * - * http://www.eclipse.org/org/documents/epl-v10.php - * - * Unless required by applicable law or agreed to in writing, software - * distributed under the License is distributed on an "AS IS" BASIS, - * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. - * See the License for the specific language governing permissions and - * limitations under the License. - */ - -package com.android.ide.common.layout; - -import static com.android.SdkConstants.ANDROID_URI; -import static com.android.SdkConstants.ATTR_LAYOUT_COLUMN; -import static com.android.SdkConstants.ATTR_LAYOUT_GRAVITY; -import static com.android.SdkConstants.ATTR_LAYOUT_ROW; -import static com.android.SdkConstants.ATTR_ORIENTATION; -import static com.android.SdkConstants.FQCN_GRID_LAYOUT; -import static com.android.SdkConstants.FQCN_SPACE; -import static com.android.SdkConstants.FQCN_SPACE_V7; -import static com.android.SdkConstants.GRAVITY_VALUE_FILL; -import static com.android.SdkConstants.GRAVITY_VALUE_FILL_HORIZONTAL; -import static com.android.SdkConstants.GRAVITY_VALUE_FILL_VERTICAL; -import static com.android.SdkConstants.GRAVITY_VALUE_LEFT; -import static com.android.SdkConstants.GRID_LAYOUT; -import static com.android.SdkConstants.VALUE_HORIZONTAL; -import static com.android.SdkConstants.VALUE_TRUE; - -import com.android.annotations.NonNull; -import com.android.annotations.Nullable; -import com.android.ide.common.api.DrawingStyle; -import com.android.ide.common.api.DropFeedback; -import com.android.ide.common.api.IDragElement; -import com.android.ide.common.api.IFeedbackPainter; -import com.android.ide.common.api.IGraphics; -import com.android.ide.common.api.IMenuCallback; -import com.android.ide.common.api.INode; -import com.android.ide.common.api.INodeHandler; -import com.android.ide.common.api.IViewMetadata; -import com.android.ide.common.api.IViewMetadata.FillPreference; -import com.android.ide.common.api.IViewRule; -import com.android.ide.common.api.InsertType; -import com.android.ide.common.api.Point; -import com.android.ide.common.api.Rect; -import com.android.ide.common.api.RuleAction; -import com.android.ide.common.api.RuleAction.Choices; -import com.android.ide.common.api.SegmentType; -import com.android.ide.common.layout.grid.GridDropHandler; -import com.android.ide.common.layout.grid.GridLayoutPainter; -import com.android.ide.common.layout.grid.GridModel; -import com.android.ide.common.layout.grid.GridModel.ViewData; -import com.android.utils.Pair; - -import java.net.URL; -import java.util.Arrays; -import java.util.Collections; -import java.util.List; -import java.util.Map; - -/** - * An {@link IViewRule} for android.widget.GridLayout which provides designtime - * interaction with GridLayouts. - * <p> - * TODO: - * <ul> - * <li>Handle multi-drag: preserving relative positions and alignments among dragged - * views. - * <li>Handle GridLayouts that have been configured in a vertical orientation. - * <li>Handle free-form editing GridLayouts that have been manually edited rather than - * built up using free-form editing (e.g. they might not follow the same spacing - * convention, might use weights etc) - * <li>Avoid setting row and column numbers on the actual elements if they can be skipped - * to make the XML leaner. - * </ul> - */ -public class GridLayoutRule extends BaseLayoutRule { - /** - * The size of the visual regular grid that we snap to (if {@link #sSnapToGrid} is set - */ - public static final int GRID_SIZE = 16; - - /** Standard gap between views */ - public static final int SHORT_GAP_DP = 16; - - /** - * The preferred margin size, in pixels - */ - public static final int MARGIN_SIZE = 32; - - /** - * Size in screen pixels in the IDE of the gutter shown for new rows and columns (in - * grid mode) - */ - private static final int NEW_CELL_WIDTH = 10; - - /** - * Maximum size of a widget relative to a cell which is allowed to fit into a cell - * (and thereby enlarge it) before it is spread with row or column spans. - */ - public static final double MAX_CELL_DIFFERENCE = 1.2; - - /** Whether debugging diagnostics is available in the toolbar */ - private static final boolean CAN_DEBUG = - VALUE_TRUE.equals(System.getenv("ADT_DEBUG_GRIDLAYOUT")); //$NON-NLS-1$ - - private static final String ACTION_ADD_ROW = "_addrow"; //$NON-NLS-1$ - private static final String ACTION_REMOVE_ROW = "_removerow"; //$NON-NLS-1$ - private static final String ACTION_ADD_COL = "_addcol"; //$NON-NLS-1$ - private static final String ACTION_REMOVE_COL = "_removecol"; //$NON-NLS-1$ - private static final String ACTION_ORIENTATION = "_orientation"; //$NON-NLS-1$ - private static final String ACTION_SHOW_STRUCTURE = "_structure"; //$NON-NLS-1$ - private static final String ACTION_GRID_MODE = "_gridmode"; //$NON-NLS-1$ - private static final String ACTION_SNAP = "_snap"; //$NON-NLS-1$ - private static final String ACTION_DEBUG = "_debug"; //$NON-NLS-1$ - - private static final URL ICON_HORIZONTAL = GridLayoutRule.class.getResource("hlinear.png"); //$NON-NLS-1$ - private static final URL ICON_VERTICAL = GridLayoutRule.class.getResource("vlinear.png"); //$NON-NLS-1$ - private static final URL ICON_ADD_ROW = GridLayoutRule.class.getResource("addrow.png"); //$NON-NLS-1$ - private static final URL ICON_REMOVE_ROW = GridLayoutRule.class.getResource("removerow.png"); //$NON-NLS-1$ - private static final URL ICON_ADD_COL = GridLayoutRule.class.getResource("addcol.png"); //$NON-NLS-1$ - private static final URL ICON_REMOVE_COL = GridLayoutRule.class.getResource("removecol.png"); //$NON-NLS-1$ - private static final URL ICON_SHOW_STRUCT = GridLayoutRule.class.getResource("showgrid.png"); //$NON-NLS-1$ - private static final URL ICON_GRID_MODE = GridLayoutRule.class.getResource("gridmode.png"); //$NON-NLS-1$ - private static final URL ICON_SNAP = GridLayoutRule.class.getResource("snap.png"); //$NON-NLS-1$ - - /** - * Whether the IDE should show diagnostics for debugging the grid layout - including - * spacers visibly in the outline, showing row and column numbers, and so on - */ - public static boolean sDebugGridLayout = CAN_DEBUG; - - /** Whether the structure (grid model) should be displayed persistently to the user */ - public static boolean sShowStructure = false; - - /** Whether the drop positions should snap to a regular grid */ - public static boolean sSnapToGrid = false; - - /** - * Whether the grid is edited in "grid mode" where the operations are row/column based - * rather than free-form - */ - public static boolean sGridMode = true; - - /** Constructs a new {@link GridLayoutRule} */ - public GridLayoutRule() { - } - - @Override - public void addLayoutActions( - @NonNull List<RuleAction> actions, - final @NonNull INode parentNode, - final @NonNull List<? extends INode> children) { - super.addLayoutActions(actions, parentNode, children); - - String namespace = getNamespace(parentNode); - Choices orientationAction = RuleAction.createChoices( - ACTION_ORIENTATION, - "Orientation", //$NON-NLS-1$ - new PropertyCallback(Collections.singletonList(parentNode), - "Change LinearLayout Orientation", namespace, ATTR_ORIENTATION), Arrays - .<String> asList("Set Horizontal Orientation", "Set Vertical Orientation"), - Arrays.<URL> asList(ICON_HORIZONTAL, ICON_VERTICAL), Arrays.<String> asList( - "horizontal", "vertical"), getCurrentOrientation(parentNode), - null /* icon */, -10, false); - orientationAction.setRadio(true); - actions.add(orientationAction); - - // Gravity and margins - if (children != null && children.size() > 0) { - actions.add(RuleAction.createSeparator(35)); - actions.add(createMarginAction(parentNode, children)); - actions.add(createGravityAction(children, ATTR_LAYOUT_GRAVITY)); - } - - IMenuCallback actionCallback = new IMenuCallback() { - @Override - public void action( - final @NonNull RuleAction action, - @NonNull List<? extends INode> selectedNodes, - final @Nullable String valueId, - final @Nullable Boolean newValue) { - parentNode.editXml("Add/Remove Row/Column", new INodeHandler() { - @Override - public void handle(@NonNull INode n) { - String id = action.getId(); - if (id.equals(ACTION_SHOW_STRUCTURE)) { - sShowStructure = !sShowStructure; - mRulesEngine.redraw(); - return; - } else if (id.equals(ACTION_GRID_MODE)) { - sGridMode = !sGridMode; - mRulesEngine.redraw(); - return; - } else if (id.equals(ACTION_SNAP)) { - sSnapToGrid = !sSnapToGrid; - mRulesEngine.redraw(); - return; - } else if (id.equals(ACTION_DEBUG)) { - sDebugGridLayout = !sDebugGridLayout; - mRulesEngine.layout(); - return; - } - - GridModel grid = GridModel.get(mRulesEngine, parentNode, null); - if (id.equals(ACTION_ADD_ROW)) { - grid.addRow(children); - } else if (id.equals(ACTION_REMOVE_ROW)) { - grid.removeRows(children); - } else if (id.equals(ACTION_ADD_COL)) { - grid.addColumn(children); - } else if (id.equals(ACTION_REMOVE_COL)) { - grid.removeColumns(children); - } - } - - }); - } - }; - - actions.add(RuleAction.createSeparator(142)); - - actions.add(RuleAction.createToggle(ACTION_GRID_MODE, "Grid Model Mode", - sGridMode, actionCallback, ICON_GRID_MODE, 145, false)); - - // Add and Remove Column actions only apply in Grid Mode - if (sGridMode) { - actions.add(RuleAction.createToggle(ACTION_SHOW_STRUCTURE, "Show Structure", - sShowStructure, actionCallback, ICON_SHOW_STRUCT, 147, false)); - - // Add Row and Add Column - actions.add(RuleAction.createSeparator(150)); - actions.add(RuleAction.createAction(ACTION_ADD_COL, "Add Column", actionCallback, - ICON_ADD_COL, 160, false /* supportsMultipleNodes */)); - actions.add(RuleAction.createAction(ACTION_ADD_ROW, "Add Row", actionCallback, - ICON_ADD_ROW, 165, false)); - - // Remove Row and Remove Column (if something is selected) - if (children != null && children.size() > 0) { - // TODO: Add "Merge Columns" and "Merge Rows" ? - - actions.add(RuleAction.createAction(ACTION_REMOVE_COL, "Remove Column", - actionCallback, ICON_REMOVE_COL, 170, false)); - actions.add(RuleAction.createAction(ACTION_REMOVE_ROW, "Remove Row", - actionCallback, ICON_REMOVE_ROW, 175, false)); - } - - actions.add(RuleAction.createSeparator(185)); - } else { - actions.add(RuleAction.createToggle(ACTION_SHOW_STRUCTURE, "Show Structure", - sShowStructure, actionCallback, ICON_SHOW_STRUCT, 190, false)); - - // Snap to Grid and Show Structure are only relevant in free form mode - actions.add(RuleAction.createToggle(ACTION_SNAP, "Snap to Grid", - sSnapToGrid, actionCallback, ICON_SNAP, 200, false)); - } - - // Temporary: Diagnostics for GridLayout - if (CAN_DEBUG) { - actions.add(RuleAction.createToggle(ACTION_DEBUG, "Debug", - sDebugGridLayout, actionCallback, null, 210, false)); - } - } - - /** - * Returns the orientation attribute value currently used by the node (even if not - * defined, in which case the default horizontal value is returned) - */ - private String getCurrentOrientation(final INode node) { - String orientation = node.getStringAttr(getNamespace(node), ATTR_ORIENTATION); - if (orientation == null || orientation.length() == 0) { - orientation = VALUE_HORIZONTAL; - } - return orientation; - } - - @Override - public DropFeedback onDropEnter(@NonNull INode targetNode, @Nullable Object targetView, - @Nullable IDragElement[] elements) { - GridDropHandler userData = new GridDropHandler(this, targetNode, targetView); - IFeedbackPainter painter = GridLayoutPainter.createDropFeedbackPainter(this, elements); - return new DropFeedback(userData, painter); - } - - @Override - public DropFeedback onDropMove(@NonNull INode targetNode, @NonNull IDragElement[] elements, - @Nullable DropFeedback feedback, @NonNull Point p) { - if (feedback == null) { - return null; - } - feedback.requestPaint = true; - - GridDropHandler handler = (GridDropHandler) feedback.userData; - handler.computeMatches(feedback, p); - - return feedback; - } - - @Override - public void onDropped(final @NonNull INode targetNode, final @NonNull IDragElement[] elements, - @Nullable DropFeedback feedback, @NonNull Point p) { - if (feedback == null) { - return; - } - - Rect b = targetNode.getBounds(); - if (!b.isValid()) { - return; - } - - GridDropHandler dropHandler = (GridDropHandler) feedback.userData; - if (dropHandler.getRowMatch() == null || dropHandler.getColumnMatch() == null) { - return; - } - - // Collect IDs from dropped elements and remap them to new IDs - // if this is a copy or from a different canvas. - Map<String, Pair<String, String>> idMap = getDropIdMap(targetNode, elements, - feedback.isCopy || !feedback.sameCanvas); - - for (IDragElement element : elements) { - INode newChild; - if (!sGridMode) { - newChild = dropHandler.handleFreeFormDrop(targetNode, element); - } else { - newChild = dropHandler.handleGridModeDrop(targetNode, element); - } - - // Copy all the attributes, modifying them as needed. - addAttributes(newChild, element, idMap, DEFAULT_ATTR_FILTER); - - addInnerElements(newChild, element, idMap); - } - } - - @Override - public void onChildInserted(@NonNull INode node, @NonNull INode parent, - @NonNull InsertType insertType) { - if (insertType == InsertType.MOVE_WITHIN) { - // Don't adjust widths/heights/weights when just moving within a single layout - return; - } - - if (GridModel.isSpace(node.getFqcn())) { - return; - } - - // Attempt to set "fill" properties on newly added views such that for example - // a text field will stretch horizontally. - String fqcn = node.getFqcn(); - IViewMetadata metadata = mRulesEngine.getMetadata(fqcn); - FillPreference fill = metadata.getFillPreference(); - String gravity = computeDefaultGravity(fill); - if (gravity != null) { - node.setAttribute(getNamespace(parent), ATTR_LAYOUT_GRAVITY, gravity); - } - } - - /** - * Returns the namespace URI to use for GridLayout-specific attributes, such - * as columnCount, layout_column, layout_column_span, layout_gravity etc. - * - * @param layout the GridLayout instance to look up the namespace for - * @return the namespace, never null - */ - public String getNamespace(INode layout) { - String namespace = ANDROID_URI; - - String fqcn = layout.getFqcn(); - if (!fqcn.equals(GRID_LAYOUT) && !fqcn.equals(FQCN_GRID_LAYOUT)) { - namespace = mRulesEngine.getAppNameSpace(); - } - - return namespace; - } - - /** - * Computes the default gravity to be used for a widget of the given fill - * preference when added to a grid layout - * - * @param fill the fill preference for the widget - * @return the gravity value, or null, to be set on the widget - */ - public static String computeDefaultGravity(FillPreference fill) { - String horizontal = GRAVITY_VALUE_LEFT; - String vertical = null; - if (fill.fillHorizontally(true /*verticalContext*/)) { - horizontal = GRAVITY_VALUE_FILL_HORIZONTAL; - } - if (fill.fillVertically(true /*verticalContext*/)) { - vertical = GRAVITY_VALUE_FILL_VERTICAL; - } - String gravity; - if (horizontal == GRAVITY_VALUE_FILL_HORIZONTAL - && vertical == GRAVITY_VALUE_FILL_VERTICAL) { - gravity = GRAVITY_VALUE_FILL; - } else if (vertical != null) { - gravity = horizontal + '|' + vertical; - } else { - gravity = horizontal; - } - - return gravity; - } - - @Override - public void onRemovingChildren(@NonNull List<INode> deleted, @NonNull INode parent, - boolean moved) { - super.onRemovingChildren(deleted, parent, moved); - - if (!sGridMode) { - // Attempt to clean up spacer objects for any newly-empty rows or columns - // as the result of this deletion - GridModel grid = GridModel.get(mRulesEngine, parent, null); - grid.onDeleted(deleted); - } - } - - @Override - protected void paintResizeFeedback(IGraphics gc, INode node, ResizeState state) { - if (!sGridMode) { - GridModel grid = getGrid(state); - GridLayoutPainter.paintResizeFeedback(gc, state.layout, grid); - } - - if (resizingWidget(state)) { - super.paintResizeFeedback(gc, node, state); - } else { - GridModel grid = getGrid(state); - int startColumn = grid.getColumn(state.bounds.x); - int endColumn = grid.getColumn(state.bounds.x2()); - int columnSpan = endColumn - startColumn + 1; - - int startRow = grid.getRow(state.bounds.y); - int endRow = grid.getRow(state.bounds.y2()); - int rowSpan = endRow - startRow + 1; - - Rect cellBounds = grid.getCellBounds(startRow, startColumn, rowSpan, columnSpan); - gc.useStyle(DrawingStyle.RESIZE_PREVIEW); - gc.drawRect(cellBounds); - } - } - - /** Returns the grid size cached on the given {@link ResizeState} object */ - private GridModel getGrid(ResizeState resizeState) { - GridModel grid = (GridModel) resizeState.clientData; - if (grid == null) { - grid = GridModel.get(mRulesEngine, resizeState.layout, resizeState.layoutView); - resizeState.clientData = grid; - } - - return grid; - } - - @Override - protected void setNewSizeBounds(ResizeState state, INode node, INode layout, - Rect oldBounds, Rect newBounds, SegmentType horizontalEdge, SegmentType verticalEdge) { - - if (resizingWidget(state)) { - if (state.fillWidth || state.fillHeight || state.wrapWidth || state.wrapHeight) { - GridModel grid = getGrid(state); - ViewData view = grid.getView(node); - if (view != null) { - String gravityString = grid.getGridAttribute(view.node, ATTR_LAYOUT_GRAVITY); - int gravity = GravityHelper.getGravity(gravityString, 0); - if (view.column > 0 && verticalEdge != null && state.fillWidth) { - state.fillWidth = false; - state.wrapWidth = true; - gravity &= ~GravityHelper.GRAVITY_HORIZ_MASK; - gravity |= GravityHelper.GRAVITY_FILL_HORIZ; - } else if (verticalEdge != null && state.wrapWidth) { - gravity &= ~GravityHelper.GRAVITY_HORIZ_MASK; - gravity |= GravityHelper.GRAVITY_LEFT; - } - if (view.row > 0 && horizontalEdge != null && state.fillHeight) { - state.fillHeight = false; - state.wrapHeight = true; - gravity &= ~GravityHelper.GRAVITY_VERT_MASK; - gravity |= GravityHelper.GRAVITY_FILL_VERT; - } else if (horizontalEdge != null && state.wrapHeight) { - gravity &= ~GravityHelper.GRAVITY_VERT_MASK; - gravity |= GravityHelper.GRAVITY_TOP; - } - gravityString = GravityHelper.getGravity(gravity); - grid.setGridAttribute(view.node, ATTR_LAYOUT_GRAVITY, gravityString); - // Fall through and set layout_width and/or layout_height to wrap_content - } - } - super.setNewSizeBounds(state, node, layout, oldBounds, newBounds, horizontalEdge, - verticalEdge); - } else { - Pair<Integer, Integer> spans = computeResizeSpans(state); - int rowSpan = spans.getFirst(); - int columnSpan = spans.getSecond(); - GridModel grid = getGrid(state); - grid.setColumnSpanAttribute(node, columnSpan); - grid.setRowSpanAttribute(node, rowSpan); - - ViewData view = grid.getView(node); - if (view != null) { - String gravityString = grid.getGridAttribute(view.node, ATTR_LAYOUT_GRAVITY); - int gravity = GravityHelper.getGravity(gravityString, 0); - if (verticalEdge != null && columnSpan > 1) { - gravity &= ~GravityHelper.GRAVITY_HORIZ_MASK; - gravity |= GravityHelper.GRAVITY_FILL_HORIZ; - } - if (horizontalEdge != null && rowSpan > 1) { - gravity &= ~GravityHelper.GRAVITY_VERT_MASK; - gravity |= GravityHelper.GRAVITY_FILL_VERT; - } - gravityString = GravityHelper.getGravity(gravity); - grid.setGridAttribute(view.node, ATTR_LAYOUT_GRAVITY, gravityString); - } - } - } - - @Override - protected String getResizeUpdateMessage(ResizeState state, INode child, INode parent, - Rect newBounds, SegmentType horizontalEdge, SegmentType verticalEdge) { - Pair<Integer, Integer> spans = computeResizeSpans(state); - if (resizingWidget(state)) { - String width = state.getWidthAttribute(); - String height = state.getHeightAttribute(); - - String message; - if (horizontalEdge == null) { - message = width; - } else if (verticalEdge == null) { - message = height; - } else { - // U+00D7: Unicode for multiplication sign - message = String.format("%s \u00D7 %s", width, height); - } - - // Tack on a tip about using the Shift modifier key - return String.format("%s\n(Press Shift to resize row/column spans)", message); - } else { - int rowSpan = spans.getFirst(); - int columnSpan = spans.getSecond(); - return String.format("ColumnSpan=%d, RowSpan=%d\n(Release Shift to resize widget itself)", - columnSpan, rowSpan); - } - } - - /** - * Returns true if we're resizing the widget, and false if we're resizing the cell - * spans - */ - private static boolean resizingWidget(ResizeState state) { - return (state.modifierMask & DropFeedback.MODIFIER2) == 0; - } - - /** - * Computes the new column and row spans as the result of the current resizing - * operation - */ - private Pair<Integer, Integer> computeResizeSpans(ResizeState state) { - GridModel grid = getGrid(state); - - int startColumn = grid.getColumn(state.bounds.x); - int endColumn = grid.getColumn(state.bounds.x2()); - int columnSpan = endColumn - startColumn + 1; - - int startRow = grid.getRow(state.bounds.y); - int endRow = grid.getRow(state.bounds.y2()); - int rowSpan = endRow - startRow + 1; - - return Pair.of(rowSpan, columnSpan); - } - - /** - * Returns the size of the new cell gutter in layout coordinates - * - * @return the size of the new cell gutter in layout coordinates - */ - public int getNewCellSize() { - return mRulesEngine.screenToLayout(NEW_CELL_WIDTH / 2); - } - - @Override - public void paintSelectionFeedback(@NonNull IGraphics graphics, @NonNull INode parentNode, - @NonNull List<? extends INode> childNodes, @Nullable Object view) { - super.paintSelectionFeedback(graphics, parentNode, childNodes, view); - - if (sShowStructure) { - // TODO: Cache the grid - if (view != null) { - if (GridLayoutPainter.paintStructure(view, DrawingStyle.GUIDELINE_DASHED, - parentNode, graphics)) { - return; - } - } - GridLayoutPainter.paintStructure(DrawingStyle.GUIDELINE_DASHED, - parentNode, graphics, GridModel.get(mRulesEngine, parentNode, view)); - } else if (sDebugGridLayout) { - GridLayoutPainter.paintStructure(DrawingStyle.GRID, - parentNode, graphics, GridModel.get(mRulesEngine, parentNode, view)); - } - - // TBD: Highlight the cells around the selection, and display easy controls - // for for example tweaking the rowspan/colspan of a cell? (but only in grid mode) - } - - /** - * Paste into a GridLayout. We have several possible behaviors (and many - * more than are listed here): - * <ol> - * <li> Preserve the current positions of the elements (if pasted from another - * canvas, not just XML markup copied from say a web site) and apply those - * into the current grid. This might mean "overwriting" (sitting on top of) - * existing elements. - * <li> Fill available "holes" in the grid. - * <li> Lay them out consecutively, row by row, like text. - * <li> Some hybrid approach, where I attempt to preserve the <b>relative</b> - * relationships (columns/wrapping, spacing between the pasted views etc) - * but I append them to the bottom of the layout on one or more new rows. - * <li> Try to paste at the current mouse position, if known, preserving the - * relative distances between the existing elements there. - * </ol> - * Attempting to preserve the current position isn't possible right now, - * because the clipboard data contains only the textual representation of - * the markup. (We'd need to stash position information from a previous - * layout render along with the clipboard data). - * <p> - * Currently, this implementation simply lays out the elements row by row, - * approach #3 above. - */ - @Override - public void onPaste( - @NonNull INode targetNode, - @Nullable Object targetView, - @NonNull IDragElement[] elements) { - DropFeedback feedback = onDropEnter(targetNode, targetView, elements); - if (feedback != null) { - Rect b = targetNode.getBounds(); - if (!b.isValid()) { - return; - } - - Map<String, Pair<String, String>> idMap = getDropIdMap(targetNode, elements, - true /* remap id's */); - - for (IDragElement element : elements) { - // Skip <Space> elements and only insert the real elements being - // copied - if (elements.length > 1 && (FQCN_SPACE.equals(element.getFqcn()) - || FQCN_SPACE_V7.equals(element.getFqcn()))) { - continue; - } - - String fqcn = element.getFqcn(); - INode newChild = targetNode.appendChild(fqcn); - addAttributes(newChild, element, idMap, DEFAULT_ATTR_FILTER); - - // Ensure that we reset any potential row/column attributes from a different - // grid layout being copied from - GridDropHandler handler = (GridDropHandler) feedback.userData; - GridModel grid = handler.getGrid(); - grid.setGridAttribute(newChild, ATTR_LAYOUT_COLUMN, null); - grid.setGridAttribute(newChild, ATTR_LAYOUT_ROW, null); - - // TODO: Set columnSpans to avoid making these widgets completely - // break the layout - // Alternatively, I could just lay them all out on subsequent lines - // with a column span of columnSpan5 - - addInnerElements(newChild, element, idMap); - } - } - } -} |