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pointerPressed(int x, int y) pointerDragged(int x, int y) pointerReleased(int x, int y)
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The Canvas class is abstract and so it requires the application to subclass it in order to use these methods. The default implementation for the callback methods or event delivery methods, as they are called in the MIDP API documentation, is empty. This means that the application, by default, takes no action when the low-level key events fire and these methods are called. The application must override these methods in the implementation subclass of Canvas in order for the application to handle the lowlevel events. You probably noticed the pointer methods at the bottom of the event handling methods above. A pointing device or input mechanism is considered optional for MIDP devices. Some devices do not support a pointer input device. In this case, the pointer methods will never be called. The Canvas class does have two methods, hasPointerEvents() and hasPointerMotionEvents(), for checking whether a pointer is available. Likewise, not all devices allow for repeated key presses. A hasRepeatEvents() method is available to check for this option s availability on the device. The Canvas class also has other event delivery methods that are not associated with the key or pointer related events. These include:
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showNotify() hideNotify() paint(Graphics g)
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The showNotify() method is called prior to a canvas actually being displayed. Alternately, the hideNotify() method is called after a canvas has been removed from display. The key and pointer event handling, paint and command callback methods can only be called if the Canvas object is actually being displayed. Like the high-level event callback methods, the event delivery methods are also called serially. Therefore, the device will never call any two event delivery methods in parallel. An event delivery method is invoked only after an earlier event delivery method returns. Commands with the Canvas A Canvas object is also a Displayable object and so can have Command objects attached to it. Therefore, a Canvas object can participate in high-level and low-level event handling. Commands are particularly useful for navigating to and from the different displays. However, the Canvas object was meant to provide an encapsulating drawing object for low-level user interfaces such as those required in games and geographical display systems. Some devices may not provide high-level command events when the Canvas and low-level user interface graphical elements are displayed. In this case, the device may provide a means to switch in and out of the command mode with the use of a hot key on the device. The Canvas object s showNotify() and hideNotify() methods are called during these transitions. HANDLING USER INTERACTIONS IN MIDP 113
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Handling the events of the Investment Quote Application In the first part of this chapter, we were able to draw some very nice user interfaces with both high-level and low-level user interface APIs. The problem with these interfaces, as already indicated, is that there is no way for the user to indicate what he wants done on any display. Once the user has entered the symbol for the investment, he cannot tell the system to retrieve the quote. Once he has seen the prices for an investment, he cannot tell the system to stop and leave the application. In this portion of the tutorial, we will add Commands to the user interface and allow the application to react to user interactions causing events triggered by commands as well as other items shown on the display. Using ItemStateListener In the tutorial application, the customer is requested to enter the symbol for an investment for which they would like price information. Except for unusual circumstances, common stocks are given three, four or five letter symbols. Thus, the text field in our entry form was given a maximum size of 5 characters. Mutual funds are also up to five letters in length, but a mutual fund symbol ends in the letter X. To help insure that the customers have entered an appropriate string of characters when requesting a price quote for a mutual fund, the tutorial application is retrofitted to check the customer s input on the entry form s symbolField when the Fund choice is selected from the form s choice group. This is accomplished by outfitting the MIDlets with an ItemStateListener to listen for item state changes to the choice group item called investmentChoice (see chapter 3 for a review of the tutorial application user interface). A single method is added to our MIDlet that establishes the ItemStateListener and registers it with the EntryForm.
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