Java tutorial
/* * DBeaver - Universal Database Manager * Copyright (C) 2010-2017 Serge Rider (serge@jkiss.org) * * Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0 * * 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 org.jkiss.dbeaver.ui.controls.resultset.panel; import org.eclipse.jface.action.Action; import org.eclipse.jface.action.IContributionManager; import org.eclipse.jface.action.Separator; import org.eclipse.jface.action.ToolBarManager; import org.eclipse.jface.dialogs.IDialogSettings; import org.eclipse.jface.viewers.ISelectionChangedListener; import org.eclipse.jface.viewers.ISelectionProvider; import org.eclipse.jface.viewers.SelectionChangedEvent; import org.eclipse.swt.SWT; import org.eclipse.swt.events.DisposeEvent; import org.eclipse.swt.events.DisposeListener; import org.eclipse.swt.events.PaintEvent; import org.eclipse.swt.events.PaintListener; import org.eclipse.swt.graphics.Point; import org.eclipse.swt.graphics.Rectangle; import org.eclipse.swt.layout.FillLayout; import org.eclipse.swt.layout.GridData; import org.eclipse.swt.layout.GridLayout; import org.eclipse.swt.widgets.Composite; import org.eclipse.swt.widgets.Control; import org.jkiss.code.Nullable; import org.jkiss.dbeaver.DBException; import org.jkiss.dbeaver.DBeaverPreferences; import org.jkiss.dbeaver.Log; import org.jkiss.dbeaver.core.DBeaverCore; import org.jkiss.dbeaver.model.DBPImage; import org.jkiss.dbeaver.model.data.DBDAttributeBinding; import org.jkiss.dbeaver.model.data.DBDValue; import org.jkiss.dbeaver.ui.ActionUtils; import org.jkiss.dbeaver.ui.DBeaverIcons; import org.jkiss.dbeaver.ui.UIIcon; import org.jkiss.dbeaver.ui.UIUtils; import org.jkiss.dbeaver.ui.controls.resultset.*; import org.jkiss.dbeaver.ui.data.IValueController; import org.jkiss.dbeaver.ui.data.IValueEditor; import org.jkiss.dbeaver.ui.data.IValueManager; import org.jkiss.dbeaver.ui.data.editors.BaseValueEditor; import org.jkiss.dbeaver.ui.data.editors.ReferenceValueEditor; import org.jkiss.utils.CommonUtils; /** * RSV value view panel */ public class ViewValuePanel implements IResultSetPanel { private static final Log log = Log.getLog(ViewValuePanel.class); public static final String PANEL_ID = "value-view"; public static final String SETTINGS_SECTION = "panel-" + PANEL_ID; private static final String VALUE_VIEW_CONTROL_ID = "org.jkiss.dbeaver.ui.resultset.panel.valueView"; private IResultSetPresentation presentation; private Composite viewPlaceholder; private ResultSetValueController previewController; private IValueEditor valueEditor; private ReferenceValueEditor referenceValueEditor; private volatile boolean valueSaving; private IValueManager valueManager; public static IDialogSettings getPanelSettings() { return ResultSetUtils.getViewerSettings(SETTINGS_SECTION); } public ViewValuePanel() { } @Override public String getPanelTitle() { return "Value"; } @Override public DBPImage getPanelImage() { return UIIcon.PANEL_VALUE; } @Override public String getPanelDescription() { return "Value view/edit"; } @Override public Control createContents(IResultSetPresentation presentation, Composite parent) { this.presentation = presentation; viewPlaceholder = new Composite(parent, SWT.NONE); viewPlaceholder.setLayout(new FillLayout()); viewPlaceholder.addPaintListener(new PaintListener() { @Override public void paintControl(PaintEvent e) { if (viewPlaceholder.getChildren().length == 0) { String hidePanelCmd = ActionUtils.findCommandDescription( ResultSetCommandHandler.CMD_TOGGLE_PANELS, ViewValuePanel.this.presentation.getController().getSite(), true); UIUtils.drawMessageOverControl(viewPlaceholder, e, "Select a cell to view/edit value", 0); UIUtils.drawMessageOverControl(viewPlaceholder, e, "Press " + hidePanelCmd + " to hide this panel", 20); } } }); /* addTraverseListener(new TraverseListener() { @Override public void keyTraversed(TraverseEvent e) { if (e.detail == SWT.TRAVERSE_ESCAPE) { hidePanel(); e.doit = false; } } }); */ if (this.presentation instanceof ISelectionProvider) { final ISelectionProvider selectionProvider = (ISelectionProvider) this.presentation; final ISelectionChangedListener selectionListener = new ISelectionChangedListener() { @Override public void selectionChanged(SelectionChangedEvent event) { if (ViewValuePanel.this.presentation.getController().getVisiblePanel() == ViewValuePanel.this) { refreshValue(false); } } }; selectionProvider.addSelectionChangedListener(selectionListener); viewPlaceholder.addDisposeListener(new DisposeListener() { @Override public void widgetDisposed(DisposeEvent e) { selectionProvider.removeSelectionChangedListener(selectionListener); } }); } return viewPlaceholder; } @Override public void activatePanel() { refreshValue(false); } @Override public void deactivatePanel() { // Dispose panel control if (viewPlaceholder != null && !viewPlaceholder.isDisposed()) { viewPlaceholder.dispose(); viewPlaceholder = null; } } @Override public void refresh(boolean force) { refreshValue(force); } @Override public void contributeActions(ToolBarManager manager) { fillToolBar(manager); } private void refreshValue(boolean force) { DBDAttributeBinding attr = presentation.getCurrentAttribute(); ResultSetRow row = presentation.getController().getCurrentRow(); if (attr == null || row == null) { clearValue(); return; } boolean updateActions; if (previewController == null) { previewController = new ResultSetValueController(presentation.getController(), attr, row, IValueController.EditType.PANEL, viewPlaceholder) { @Override public void updateValue(@Nullable Object value, boolean updatePresentation) { valueSaving = true; try { super.updateValue(value, updatePresentation); } finally { valueSaving = false; } presentation.updateValueView(); } }; updateActions = true; force = true; } else { updateActions = force = (force || previewController.getBinding() != attr); previewController.setCurRow(row); previewController.setBinding(attr); } viewValue(force); if (updateActions) { presentation.getController().updatePanelActions(); } } private void viewValue(boolean forceRefresh) { if (valueSaving) { return; } if (valueManager == null || valueEditor == null) { forceRefresh = true; } if (forceRefresh) { cleanupPanel(); // Create a new one valueManager = previewController.getValueManager(); try { valueEditor = valueManager.createEditor(previewController); } catch (Throwable e) { UIUtils.showErrorDialog(viewPlaceholder.getShell(), "Value preview", "Can't create value viewer", e); return; } if (valueEditor != null) { try { valueEditor.createControl(); } catch (Exception e) { log.error(e); } Control control = valueEditor.getControl(); if (control != null) { UIUtils.addFocusTracker(presentation.getController().getSite(), VALUE_VIEW_CONTROL_ID, control); presentation.getController().lockActionsByFocus(control); } referenceValueEditor = new ReferenceValueEditor(previewController, valueEditor); if (referenceValueEditor.isReferenceValue()) { GridLayout gl = new GridLayout(1, false); viewPlaceholder.setLayout(gl); valueEditor.getControl().setLayoutData(new GridData(GridData.FILL_HORIZONTAL)); referenceValueEditor.createEditorSelector(viewPlaceholder); } else { viewPlaceholder.setLayout(new FillLayout()); } } else { final Composite placeholder = UIUtils.createPlaceholder(viewPlaceholder, 1); placeholder.setBackground(placeholder.getDisplay().getSystemColor(SWT.COLOR_WIDGET_BACKGROUND)); placeholder.addPaintListener(new PaintListener() { @Override public void paintControl(PaintEvent e) { Rectangle bounds = placeholder.getBounds(); String message = "No editor for [" + previewController.getValueType().getTypeName() + "]"; Point ext = e.gc.textExtent(message); e.gc.drawText(message, (bounds.width - ext.x) / 2, bounds.height / 3 + 20); } }); referenceValueEditor = null; } viewPlaceholder.layout(); } if (valueEditor instanceof BaseValueEditor) { ((BaseValueEditor) valueEditor).setAutoSaveEnabled(false); } if (valueEditor != null) { try { Object newValue = previewController.getValue(); if (newValue instanceof DBDValue) { // Do not check for difference valueEditor.primeEditorValue(newValue); } else { Object oldValue = null; try { if (previewController.getExecutionContext() != null) { oldValue = valueEditor.extractEditorValue(); } } catch (Throwable e) { // Some error extracting current value // This may happen if we were disconnected } if (!CommonUtils.equalObjects(oldValue, newValue)) { valueEditor.primeEditorValue(newValue); } } } catch (DBException e) { log.error(e); } valueEditor.setDirty(false); } if (valueEditor instanceof BaseValueEditor) { ((BaseValueEditor) valueEditor).setAutoSaveEnabled(true); } } public void saveValue() { if (valueEditor == null) { return; } try { valueSaving = true; Object newValue = valueEditor.extractEditorValue(); previewController.updateValue(newValue, true); presentation.updateValueView(); } catch (Exception e) { UIUtils.showErrorDialog(null, "Value save", "Can't save edited value", e); } finally { valueSaving = false; } } public void clearValue() { cleanupPanel(); valueManager = null; valueEditor = null; presentation.getController().updateEditControls(); viewPlaceholder.layout(); } private void cleanupPanel() { // Cleanup previous viewer for (Control child : viewPlaceholder.getChildren()) { child.dispose(); } } private void fillToolBar(final IContributionManager contributionManager) { contributionManager.add(new Separator()); //contributionManager.add(new Separator()); if (valueManager != null) { try { valueManager.contributeActions(contributionManager, previewController, valueEditor); } catch (Exception e) { log.error("Can't contribute value manager actions", e); } } contributionManager.add(ActionUtils.makeCommandContribution(presentation.getController().getSite(), ValueViewCommandHandler.CMD_SAVE_VALUE)); contributionManager.add(new Action("Auto-save value", Action.AS_CHECK_BOX) { { setImageDescriptor(DBeaverIcons.getImageDescriptor(UIIcon.LINK_TO_EDITOR)); } @Override public boolean isChecked() { return DBeaverCore.getGlobalPreferenceStore() .getBoolean(DBeaverPreferences.RS_EDIT_AUTO_UPDATE_VALUE); } @Override public void run() { boolean newValue = !isChecked(); DBeaverCore.getGlobalPreferenceStore().setValue(DBeaverPreferences.RS_EDIT_AUTO_UPDATE_VALUE, newValue); presentation.getController().updatePanelActions(); } }); } }