org.rstudio.studio.client.application.ApplicationThemes.java Source code

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Here is the source code for org.rstudio.studio.client.application.ApplicationThemes.java

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/*
 * ApplicationThemes.java
 *
 * Copyright (C) 2009-18 by RStudio, Inc.
 *
 * Unless you have received this program directly from RStudio pursuant
 * to the terms of a commercial license agreement with RStudio, then
 * this program is licensed to you under the terms of version 3 of the
 * GNU Affero General Public License. This program is distributed WITHOUT
 * ANY EXPRESS OR IMPLIED WARRANTY, INCLUDING THOSE OF NON-INFRINGEMENT,
 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Please refer to the
 * AGPL (http://www.gnu.org/licenses/agpl-3.0.txt) for more details.
 *
 */
package org.rstudio.studio.client.application;

import org.rstudio.core.client.Debug;
import org.rstudio.core.client.dom.DomUtils;
import org.rstudio.studio.client.application.events.ComputeThemeColorsEvent;
import org.rstudio.studio.client.application.events.EventBus;
import org.rstudio.studio.client.application.events.ThemeChangedEvent;
import org.rstudio.studio.client.application.ui.RStudioThemes;
import org.rstudio.studio.client.server.VoidServerRequestCallback;
import org.rstudio.studio.client.workbench.prefs.model.UIPrefs;
import org.rstudio.studio.client.workbench.views.source.editors.text.themes.AceThemes;
import org.rstudio.studio.client.workbench.views.source.editors.text.themes.model.ThemeServerOperations;

import com.google.gwt.dom.client.Document;
import com.google.gwt.dom.client.Element;
import com.google.gwt.dom.client.Style;
import com.google.gwt.dom.client.Style.Position;
import com.google.gwt.dom.client.Style.Unit;
import com.google.gwt.dom.client.Style.Visibility;
import com.google.inject.Inject;
import com.google.inject.Provider;

public class ApplicationThemes implements ThemeChangedEvent.Handler, ComputeThemeColorsEvent.Handler {
    @Inject
    public ApplicationThemes(Provider<UIPrefs> pUiPrefs, Provider<AceThemes> pAceThemes, EventBus events,
            ThemeServerOperations server) {
        uiPrefs_ = pUiPrefs;
        pAceThemes_ = pAceThemes;
        events_ = events;
        server_ = server;

        events_.addHandler(ThemeChangedEvent.TYPE, this);
        events_.addHandler(ComputeThemeColorsEvent.TYPE, this);
    }

    public void initializeThemes(Element root) {
        // Save reference to root element
        root_ = root;

        // Bind theme change handlers to the uiPrefs and immediately fire a theme changed event to
        // set the initial theme.
        uiPrefs_.get().getFlatTheme().bind(theme -> events_.fireEvent(new ThemeChangedEvent()));
        uiPrefs_.get().theme().bind(theme -> events_.fireEvent(new ThemeChangedEvent()));
        events_.fireEvent(new ThemeChangedEvent());

        // Ensure creation of the Ace themes instance
        pAceThemes_.get();
    }

    @Override
    public void onComputeThemeColors(ComputeThemeColorsEvent event) {
        // Establish defaults
        String foreground = "#000000";
        String background = "#FFFFFF";

        // We're very exception sensitive here since this code runs in a
        // WaitForMethod (and therefore can hold the server while we wait for it
        // to return).
        try {
            // Create a sampler element to read runtime styles; hide it and position
            // it offscreen to ensure it doesn't flicker.
            Element sampler = Document.get().createElement("div");
            sampler.addClassName("ace_editor ace_content");
            sampler.getStyle().setVisibility(Visibility.HIDDEN);
            sampler.getStyle().setPosition(Position.ABSOLUTE);
            sampler.getStyle().setTop(-10000, Unit.PX);
            sampler.getStyle().setLeft(-10000, Unit.PX);

            // Append the sampler element to the root panel, read its content, and
            // remove it.
            root_.appendChild(sampler);
            Style style = DomUtils.getComputedStyles(sampler);
            foreground = style.getColor();
            background = style.getBackgroundColor();
            root_.removeChild(sampler);
        } catch (Exception e) {
            Debug.logException(e);
        }

        // Send the server the computed colors
        server_.setComputedThemeColors(foreground, background, new VoidServerRequestCallback());
    }

    @Override
    public void onThemeChanged(ThemeChangedEvent event) {
        RStudioThemes.initializeThemes(uiPrefs_.get(), Document.get(), root_);
    }

    private final Provider<UIPrefs> uiPrefs_;
    private final Provider<AceThemes> pAceThemes_;
    private final EventBus events_;
    private final ThemeServerOperations server_;
    private Element root_;
}