Java tutorial
/* * Copyright (C) 2014 Language In Interaction * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ package nl.ru.languageininteraction.synaesthesia.client.view; import nl.ru.languageininteraction.language.client.view.AbstractView; import com.google.gwt.canvas.client.Canvas; import com.google.gwt.canvas.dom.client.CanvasGradient; import com.google.gwt.canvas.dom.client.Context2d; import com.google.gwt.canvas.dom.client.ImageData; import com.google.gwt.core.client.JsArray; import com.google.gwt.dom.client.Style.Unit; import com.google.gwt.dom.client.Touch; import com.google.gwt.event.dom.client.ClickEvent; import com.google.gwt.event.dom.client.ClickHandler; import com.google.gwt.event.dom.client.MouseEvent; import com.google.gwt.event.dom.client.TouchEndEvent; import com.google.gwt.event.dom.client.TouchEndHandler; import com.google.gwt.event.dom.client.TouchEvent; import com.google.gwt.event.dom.client.TouchMoveEvent; import com.google.gwt.event.dom.client.TouchMoveHandler; import com.google.gwt.event.dom.client.TouchStartEvent; import com.google.gwt.event.dom.client.TouchStartHandler; import com.google.gwt.event.logical.shared.CloseEvent; import com.google.gwt.event.logical.shared.CloseHandler; import com.google.gwt.user.client.Random; import com.google.gwt.user.client.Window; import com.google.gwt.user.client.ui.Button; import com.google.gwt.user.client.ui.Grid; import com.google.gwt.user.client.ui.HasVerticalAlignment; import com.google.gwt.user.client.ui.Label; import com.google.gwt.user.client.ui.PopupPanel; import com.google.gwt.user.client.ui.ScrollPanel; import com.google.gwt.user.client.ui.VerticalPanel; import nl.ru.languageininteraction.synaesthesia.client.exception.CanvasError; import nl.ru.languageininteraction.language.client.listener.PresenterEventListner; import nl.ru.languageininteraction.language.client.model.ColourData; import nl.ru.languageininteraction.language.client.model.Stimulus; /** * @since Oct 8, 2014 5:09:10 PM (creation date) * @author Peter Withers <p.withers@psych.ru.nl> */ public class ColourPickerCanvasView extends AbstractView { private final Canvas mainCanvas; private final Canvas hueCanvas; private final Grid outerGrid; private final Grid innerGrid; private final Grid pickerPanel; private final Grid progressPanel; private final VerticalPanel stimulusPanel; private final VerticalPanel selectedColourPanel; private final Button infoButton; private final Button quitButton; private Button acceptButton = null; private Button rejectButton = null; private final Label progressLabel; private int canvasHeight; private int canvasWidth; private String currentHueCss; private final int stimulusTextHeight; private final int buttonHeight; private final int buttonTextHeight; private final int buttonWidth; private final int selectedColourPanelHeight; private final int selectedColourPanelWidth; private ColourData selectedColourData = null; public ColourPickerCanvasView() throws CanvasError { setStylePrimaryName("stimulusScreen"); final int clientHeight = Window.getClientHeight(); final int clientWidth = Window.getClientWidth(); final int minClient = (clientHeight > clientWidth) ? clientWidth : clientHeight; stimulusTextHeight = (int) (minClient * 0.08); selectedColourPanelHeight = (int) (minClient * 0.25); selectedColourPanelWidth = (int) (minClient * 0.47); buttonTextHeight = (int) (minClient * 0.05); buttonHeight = (int) (minClient * 0.1); buttonWidth = (int) (minClient * 0.47); stimulusPanel = new VerticalPanel(); stimulusPanel.addStyleName("stimulusPanel"); stimulusPanel.setVerticalAlignment(HasVerticalAlignment.ALIGN_MIDDLE); outerGrid = new Grid(2, 2); innerGrid = new Grid(6, 2); pickerPanel = new Grid(1, 2); progressPanel = new Grid(1, 2); progressPanel.setWidth("100%"); infoButton = new Button(); infoButton.addStyleName("stimulusHelpButton"); infoButton.getElement().getStyle().setFontSize(buttonTextHeight, Unit.PX); quitButton = new Button(); quitButton.addStyleName("stimulusQuitButton"); quitButton.getElement().getStyle().setFontSize(buttonTextHeight, Unit.PX); selectedColourPanel = new VerticalPanel(); progressLabel = new Label(); progressLabel.addStyleName("stimulusProgressLabel"); mainCanvas = Canvas.createIfSupported(); hueCanvas = Canvas.createIfSupported(); if (mainCanvas == null || hueCanvas == null) { throw new CanvasError("Failed to create a canvas for the stimulus screen."); } else { pickerPanel.setCellPadding(5); pickerPanel.setWidget(0, 0, mainCanvas); pickerPanel.setWidget(0, 1, hueCanvas); final Label selectedColourLabel = new Label(""); selectedColourLabel.setHeight(selectedColourPanelHeight + "px"); selectedColourLabel.setWidth(selectedColourPanelWidth + "px"); selectedColourPanel.add(selectedColourLabel); mainCanvas.addClickHandler(new ClickHandler() { @Override public void onClick(ClickEvent event) { event.preventDefault(); setColour(event, mainCanvas, selectedColourPanel); } }); hueCanvas.addClickHandler(new ClickHandler() { @Override public void onClick(ClickEvent event) { event.preventDefault(); setHue(event, hueCanvas); setColour(event, hueCanvas, selectedColourPanel); } }); mainCanvas.addTouchStartHandler(new TouchStartHandler() { @Override public void onTouchStart(TouchStartEvent event) { event.preventDefault(); setColour(event, mainCanvas, selectedColourPanel); } }); mainCanvas.addTouchMoveHandler(new TouchMoveHandler() { @Override public void onTouchMove(TouchMoveEvent event) { event.preventDefault(); setColour(event, mainCanvas, selectedColourPanel); } }); mainCanvas.addTouchEndHandler(new TouchEndHandler() { @Override public void onTouchEnd(TouchEndEvent event) { event.preventDefault(); setColour(event, mainCanvas, selectedColourPanel); } }); hueCanvas.addTouchStartHandler(new TouchStartHandler() { @Override public void onTouchStart(TouchStartEvent event) { event.preventDefault(); setHue(event, hueCanvas); setColour(event, hueCanvas, selectedColourPanel); } }); hueCanvas.addTouchMoveHandler(new TouchMoveHandler() { @Override public void onTouchMove(TouchMoveEvent event) { event.preventDefault(); setHue(event, hueCanvas); setColour(event, hueCanvas, selectedColourPanel); } }); hueCanvas.addTouchEndHandler(new TouchEndHandler() { @Override public void onTouchEnd(TouchEndEvent event) { event.preventDefault(); setHue(event, hueCanvas); setColour(event, hueCanvas, selectedColourPanel); } }); } outerGrid.setWidget(0, 0, pickerPanel); add(outerGrid); } private void sizeAndPaintCanvases(final int canvasHeight, final int canvasWidth, final int barWidth) { this.canvasHeight = canvasHeight; this.canvasWidth = canvasWidth; mainCanvas.setCoordinateSpaceHeight(canvasHeight); mainCanvas.setCoordinateSpaceWidth(canvasWidth); mainCanvas.setSize(canvasWidth + "px", canvasHeight + "px"); hueCanvas.setCoordinateSpaceHeight(canvasHeight); hueCanvas.setCoordinateSpaceWidth(barWidth); hueCanvas.setSize(barWidth + "px", canvasHeight + "px"); final Context2d hueContext2d = hueCanvas.getContext2d(); CanvasGradient hueGradient = hueContext2d.createLinearGradient(0, 0, 0, canvasHeight); for (int stop = 0; stop <= 10; stop++) { hueGradient.addColorStop(stop * 0.1f, "hsl(" + 36 * stop + ",100%,50%);"); } hueContext2d.setFillStyle(hueGradient); hueContext2d.fillRect(0, 0, barWidth, canvasHeight); } public void setRandomColour() { final int randomHue = Random.nextInt(360); setHue("hsl(" + randomHue + ",100%,50%)"); final int red = Random.nextInt(255); final int green = Random.nextInt(255); final int blue = Random.nextInt(255); selectedColourData = new ColourData((int) red, (int) green, (int) blue); selectedColourPanel.getElement().setAttribute("style", "background:rgb(" + (int) red + "," + (int) green + "," + (int) blue + ")"); } // todo: remove this if it proves unhelpful on samsung 4.2.2 private static boolean hueChangeInProgress = false; synchronized private void setHue(int red, int green, int blue) { setHue("rgb(" + red + "," + green + "," + blue + ")"); } synchronized private void setHue(String colourCss) { currentHueCss = colourCss; // " Android clearRect / fillRect bug" ??? // GWT documentation: JavaScript interpreters are single-threaded, so while GWT silently accepts the synchronized keyword, it has no real effect. // So we are using a simple boolean which should be adequate most of the time. We could use a timer call back, but we want to keep this simple. // However the browser is probably only single threaded anyway. if (hueChangeInProgress) { return; } hueChangeInProgress = true; final Context2d mainContext2dA = mainCanvas.getContext2d(); CanvasGradient linearColour = mainContext2dA.createLinearGradient(0, 0, canvasWidth, 0); linearColour.addColorStop(1f, "white"); linearColour.addColorStop(0f, colourCss); mainContext2dA.setFillStyle(linearColour); mainContext2dA.fillRect(0, 0, canvasWidth, canvasHeight); // todo: remove the second context get if it proves unhelpful witht the samsung 4.2.2 issue final Context2d mainContext2dB = mainCanvas.getContext2d(); CanvasGradient linearGrey = mainContext2dB.createLinearGradient(0, 0, 0, canvasHeight); linearGrey.addColorStop(1f, "black"); linearGrey.addColorStop(0f, "rgba(0,0,0,0);"); mainContext2dB.setFillStyle(linearGrey); mainContext2dB.fillRect(0, 0, canvasWidth, canvasHeight); hueChangeInProgress = false; } public ColourData getColour() { return selectedColourData; } private void setColour(MouseEvent event, Canvas targetCanvas, VerticalPanel targetPanel) { setColour(event.getRelativeX(targetCanvas.getElement()), event.getRelativeY(targetCanvas.getElement()), targetCanvas, targetPanel); } private void setColour(TouchEvent event, Canvas targetCanvas, VerticalPanel targetPanel) { if (event.getTouches().length() > 0) { final JsArray<Touch> touches = event.getTargetTouches(); if (touches.length() > 0) { Touch touch = touches.get(0); setColour(touch.getRelativeX(targetCanvas.getElement()), touch.getRelativeY(targetCanvas.getElement()), targetCanvas, targetPanel); } } } private void setColour(int x, int y, Canvas targetCanvas, VerticalPanel targetPanel) { x = (x >= targetCanvas.getCoordinateSpaceWidth()) ? targetCanvas.getCoordinateSpaceWidth() - 1 : x; y = (y >= targetCanvas.getCoordinateSpaceHeight()) ? targetCanvas.getCoordinateSpaceHeight() - 1 : y; final ImageData imageData = targetCanvas.getContext2d().getImageData(x, y, 1, 1); final int blue = imageData.getBlueAt(0, 0); final int green = imageData.getGreenAt(0, 0); final int red = imageData.getRedAt(0, 0); if (targetPanel.equals(selectedColourPanel)) { selectedColourData = new ColourData(red, green, blue); } targetPanel.getElement().setAttribute("style", "background:rgb(" + red + "," + green + "," + blue + ")"); } private void setHue(TouchEvent event, Canvas targetCanvas) { if (event.getTouches().length() > 0) { final JsArray<Touch> touches = event.getTargetTouches(); if (touches.length() > 0) { Touch touch = touches.get(0); setHue(touch.getRelativeX(targetCanvas.getElement()), touch.getRelativeY(targetCanvas.getElement()), targetCanvas); } } } private void setHue(MouseEvent event, Canvas targetCanvas) { setHue(event.getRelativeX(targetCanvas.getElement()), event.getRelativeY(targetCanvas.getElement()), targetCanvas); } private void setHue(int x, int y, Canvas targetCanvas) { x = (x >= targetCanvas.getCoordinateSpaceWidth()) ? targetCanvas.getCoordinateSpaceWidth() - 1 : x; y = (y >= targetCanvas.getCoordinateSpaceHeight()) ? targetCanvas.getCoordinateSpaceHeight() - 1 : y; final ImageData imageData = targetCanvas.getContext2d().getImageData(x, y, 1, 1); final int blue = imageData.getBlueAt(0, 0); final int green = imageData.getGreenAt(0, 0); final int red = imageData.getRedAt(0, 0); setHue(red, green, blue); } public void setQuitButton(final PresenterEventListner quitListerner) { quitButton.setText(quitListerner.getLabel()); quitButton.addClickHandler(new ClickHandler() { @Override public void onClick(ClickEvent event) { event.preventDefault(); quitListerner.eventFired(quitButton); } }); quitButton.addTouchEndHandler(new TouchEndHandler() { @Override public void onTouchEnd(TouchEndEvent event) { event.preventDefault(); quitListerner.eventFired(quitButton); } }); } public void setInstructions(final String instructions, final String infoButtonChar) { final Label instructionsLabel = new Label(instructions); final PopupPanel popupPanel = new PopupPanel(true); popupPanel.setStylePrimaryName("stimulusHelpPanel"); instructionsLabel.setStylePrimaryName("stimulusHelpText"); popupPanel.setWidget(new ScrollPanel(instructionsLabel)); infoButton.setText(infoButtonChar); popupPanel.addCloseHandler(new CloseHandler<PopupPanel>() { @Override public void onClose(CloseEvent<PopupPanel> event) { infoButton.setEnabled(true); } }); infoButton.addClickHandler(new ClickHandler() { @Override public void onClick(ClickEvent event) { event.preventDefault(); popupPanel.center(); infoButton.setEnabled(false); } }); infoButton.addTouchEndHandler(new TouchEndHandler() { @Override public void onTouchEnd(TouchEndEvent event) { event.preventDefault(); popupPanel.center(); infoButton.setEnabled(false); } }); instructionsLabel.addClickHandler(new ClickHandler() { @Override public void onClick(ClickEvent event) { event.preventDefault(); popupPanel.hide(); infoButton.setEnabled(true); } }); instructionsLabel.addTouchEndHandler(new TouchEndHandler() { @Override public void onTouchEnd(TouchEndEvent event) { event.preventDefault(); popupPanel.hide(); infoButton.setEnabled(true); } }); } public void setStimulus(Stimulus stimulus, String progress) { progressLabel.setText(progress); stimulusPanel.clear(); final Label label = new Label(stimulus.getValue()); final int length = stimulus.getValue().length(); final int stimulusSpecificHeight = (length > 3) ? stimulusTextHeight : (int) (stimulusTextHeight * 3.0 / length); stimulusPanel.setHeight(stimulusTextHeight * 3 + "px"); label.getElement().getStyle().setFontSize(stimulusSpecificHeight, Unit.PX); stimulusPanel.add(label); } public void setAcceptButton(final PresenterEventListner presenterListerner) { acceptButton = getButton(presenterListerner); } public void setRejectButton(final PresenterEventListner presenterListerner) { rejectButton = getButton(presenterListerner); } private Button getButton(final PresenterEventListner presenterListerner) { final Button nextButton = new Button(presenterListerner.getLabel()); nextButton.setHeight(buttonHeight + "px"); nextButton.setWidth(buttonWidth + "px"); nextButton.addStyleName("stimulusButton"); nextButton.getElement().getStyle().setFontSize(buttonTextHeight, Unit.PX); nextButton.setEnabled(true); nextButton.addClickHandler(new ClickHandler() { @Override public void onClick(ClickEvent event) { event.preventDefault(); presenterListerner.eventFired(nextButton); } }); nextButton.addTouchEndHandler(new TouchEndHandler() { @Override public void onTouchEnd(TouchEndEvent event) { event.preventDefault(); presenterListerner.eventFired(nextButton); } }); return nextButton; } @Override protected void parentResized(int height, int width, String units) { if (height < width) { int resizedHeight = (int) (height - 50); int resizedBarWidth = (int) (resizedHeight * 0.1); int resizedWidth = (int) (width - 50) - resizedBarWidth - buttonWidth - buttonHeight; // buttonHeight is used to allow for the info button sizeAndPaintCanvases(resizedHeight, resizedWidth, resizedBarWidth); setHue(currentHueCss); innerGrid.setWidget(0, 0, stimulusPanel); innerGrid.setWidget(1, 0, rejectButton); innerGrid.setWidget(2, 0, selectedColourPanel); innerGrid.setWidget(3, 0, acceptButton); innerGrid.setWidget(4, 0, progressLabel); progressPanel.setWidget(0, 0, infoButton); progressPanel.setWidget(0, 1, quitButton); innerGrid.setWidget(5, 0, progressPanel); outerGrid.setWidget(0, 1, innerGrid); } else { int resizedWidth = (int) (width * 0.9 - 50); int resizedBarWidth = (int) (width * 0.1); int resizedHeight = height - 50 - selectedColourPanelHeight - buttonHeight - buttonHeight; sizeAndPaintCanvases(resizedHeight, resizedWidth, resizedBarWidth); setHue(currentHueCss); innerGrid.setWidget(0, 0, stimulusPanel); innerGrid.setWidget(1, 0, rejectButton); innerGrid.setWidget(0, 1, selectedColourPanel); innerGrid.setWidget(1, 1, acceptButton); progressPanel.setWidget(0, 1, progressLabel); innerGrid.setWidget(2, 0, progressPanel); innerGrid.setWidget(2, 1, quitButton); progressPanel.setWidget(0, 0, infoButton); outerGrid.setWidget(1, 0, innerGrid); } } }