ToolTip for the button

Nice day

I'm new to the blackberry development. I created a bitmapbuttonfield using the examples of the advanced user interface. There is a button with an image. I want to display a ToolTip for the button when the button receives the focus. Can someone please help

Thanks in advance

Hello

Use this code:

package mypackage;

import net.rim.device.api.ui.Field;
import net.rim.device.api.ui.FieldChangeListener;
import net.rim.device.api.ui.component.ButtonField;
import net.rim.device.api.ui.component.Dialog;

public final class MyScreen extends TooltipScreen
{

    ButtonField btn1,btn2,btn3;
    public MyScreen() {

        btn1=new ButtonField();
        btn1.setChangeListener(new FieldChangeListener() {
            public void fieldChanged(Field field, int context) {
                Dialog.alert("Button 1 Click");
            }
        });
        btn2=new ButtonField();
        btn2.setChangeListener(new FieldChangeListener() {
            public void fieldChanged(Field field, int context) {
                Dialog.alert("Button 2 Click");
            }
        });

        btn3=new ButtonField();
        btn3.setChangeListener(new FieldChangeListener() {
            public void fieldChanged(Field field, int context) {
                Dialog.alert("Button 3 Click");
            }
        });
        add(btn1, "Button 1");
        add(btn2, "Button 2");
        add(btn3, "Button 3");

    }

}

package mypackage;

import java.util.Timer;
import java.util.TimerTask;
import java.util.Vector;

import net.rim.device.api.ui.Field;
import net.rim.device.api.ui.Graphics;
import net.rim.device.api.ui.XYRect;
import net.rim.device.api.ui.container.MainScreen;

public class TooltipScreen extends MainScreen {

    TooltipScreen screen = this;
    boolean doRedraw = false;//prevent infinte redrawing
    Vector tooltips = new Vector();//vector to hold tooltip strings
    private Timer tooltipTimer = new Timer();
    private TimerTask tooltipTask;
    boolean alive = false;//is the tooltip alive? used to pop it after our timeout
    int count = 0;//used to calculate time tooltip is displayed
    //tooltip popup colours:
    int backgroundColour = 0xeeeeee;
    int borderColour = 0xaaaaaa;
    int fontColour = 0x666666;
    //the tooltip:
    String tooltip;
    int tooltipWidth;
    int yCoord;
    int xCoord;
    //region parameters:
    XYRect contentArea;
    int contentBottom;
    int contentRight;

    public TooltipScreen() {
        super();

        //when timeout reaches 100ms*20 ie. 2seconds set alive to false and redraw screen:
        tooltipTask = new TimerTask() {

            public void run() {
                if (alive) {
                    count++;
                    if (count == 20) {
                        alive = false;
                        invalidate();
                    }
                }
            }
        };

        tooltipTimer.scheduleAtFixedRate(tooltipTask, 100, 100);

    }

    //override add method adds an empty string to tooltip vector:
    public void add(Field field) {
        tooltips.addElement("");
        super.add(field);
    }

    //custom add method for fields with tooltip: add(myField, "myTooltip");
    public void add(Field field, String tooltip) {
        super.add(field);
        tooltips.addElement(tooltip);
    }

    public void setColours(int backgroundColour, int borderColour, int fontColour) {
        this.backgroundColour = backgroundColour;
        this.borderColour = borderColour;
        this.fontColour = fontColour;
    }

    //reset everything when user changes focus,
    //possibly needs logic to check field has actually changed (for listfields, objectchoicefields etc etc)
    protected boolean navigationMovement(int dx, int dy, int status, int time) {
        count = 0;
        alive = true;
        doRedraw = true;
        return super.navigationMovement(dx, dy, status, time);
    }

    protected void paint(Graphics graphics) {
        super.paint(graphics);
        if (alive) {
            Field focusField = getFieldWithFocus();
            tooltip = (String) tooltips.elementAt(screen.getFieldWithFocusIndex());

            //don't do anything outside the norm unless this field has a tooltip:
            if (!tooltip.equals("")) {
                //get the field content region, this may fall inside the field actual region/coordinates:
                contentArea = focusField.getContentRect();
                contentBottom = contentArea.y + contentArea.height;
                contentRight = contentArea.x + contentArea.width;

                //+4 to accomodate 2 pixel padding on either side:
                tooltipWidth = graphics.getFont().getAdvance(tooltip) + 4;

                yCoord = contentBottom - focusField.getManager().getVerticalScroll();
                //check the tooltip is being drawn fully inside the screen height:
                if (yCoord > (getHeight() - 30)) {
                    yCoord = getHeight() - 30;
                }

                //check the tooltip doesn't get drawn off the right side of the screen:
                if (contentRight + tooltipWidth < getWidth()) {
                    xCoord = contentRight;
                } else {
                    xCoord = getWidth() - tooltipWidth;
                }

                //draw the tooltip
                graphics.setColor(backgroundColour);
                graphics.fillRect(xCoord, yCoord, tooltipWidth, 30);
                graphics.setColor(borderColour);
                graphics.drawRect(xCoord, yCoord, tooltipWidth, 30);
                graphics.setColor(fontColour);
                graphics.drawText(tooltip, xCoord + 2, yCoord);
            }
        }
        //doRedraw logic prevents infinite loop
        if (doRedraw) {
            //System.out.println("redrawing screen: " + System.currentTimeMillis());
            screen.invalidate();
            doRedraw = false;
        }
    }
}

package mypackage;

import net.rim.device.api.ui.Font;
import net.rim.device.api.ui.Graphics;
import net.rim.device.api.ui.Manager;
import net.rim.device.api.ui.UiApplication;
import net.rim.device.api.ui.component.LabelField;
import net.rim.device.api.ui.container.PopupScreen;
import net.rim.device.api.ui.container.VerticalFieldManager;

class MyTooltip extends PopupScreen{
    int _x;
    int _y;
    TooltipThread _tooltipThread;

    private MyTooltip(Manager manager) {
        super(manager);
     }
    public void sublayout(int width, int height)    {
        super.sublayout(width,height);
        setPosition(_x,_y);
        System.out.println("Tooltip x: " + Integer.toString(_x) + ", y: " + Integer.toString(_y));
    }
    protected void applyTheme() {
        // Overriden to suppress Border etc.
    }
    public void removeToolTip() {
        if ( _tooltipThread != null ) {
            _tooltipThread.dismiss();
        }
    }
    private void display(UiApplication uiApp, int x, int y, int displayTime) {
        _x = x;
        _y = y;
        _tooltipThread = new TooltipThread(uiApp, this, displayTime);
        _tooltipThread.start();
    }

    public static MyTooltip addToolTip(UiApplication uiApp, String toolTipString, int x, int y, int displayTime) {
        VerticalFieldManager manager = new VerticalFieldManager(Manager.FIELD_VCENTER|Manager.NON_FOCUSABLE) {
            protected void paint(Graphics graphics) {
                graphics.setColor(0x00FFFFFF); // White
                graphics.fillRect(0,0,getWidth(),getHeight());
                graphics.setColor(0x00000000); // Black
                graphics.drawRect(0,0,getWidth(),getHeight());
                super.paint(graphics);
            }
        };
        MyTooltip toolTip = new MyTooltip(manager);
        LabelField label = new LabelField(' ' + toolTipString + ' ', LabelField.NON_FOCUSABLE);
        label.setFont(Font.getDefault().derive(Font.PLAIN, 16));
        toolTip.add(label);
        toolTip.display(uiApp, x, y, displayTime);
        return toolTip;
    }

    class TooltipThread extends Thread {

        Object _notifyObject = new Object(); // Used to allow user to dismiss this Tooltip
        PopupScreen _tooltip; // Screen we are going to display
        UiApplication _ourApplication; // access to pushGlobalScreen and dismissStatus from our Application
        int _displayTime; // in seconds

        public TooltipThread(UiApplication ourApplication, PopupScreen tooltip, int displayTime) {
            _tooltip = tooltip;
            _ourApplication = ourApplication;
            _displayTime = displayTime;
        }

        public void run() {
            _ourApplication.pushGlobalScreen(_tooltip, 999, false);
            synchronized(_notifyObject) {
                try {
                    _notifyObject.wait(_displayTime * 1000);
                } catch (Exception e) {
                }
            };
            _ourApplication.dismissStatus(_tooltip);
        }

        public void dismiss() {
            // notify the waiting object to stop the Thread waiting
            synchronized(_notifyObject) {
                _notifyObject.notify();
            }
        }

    }

}

Tags: BlackBerry Developers

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