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REVISITING THE ACTIVATION EVENTS Before we leave this section, there is one more additional change required in our program. Take a look at the following OnActivated and OnDeactivate methods from the MainForm class. As we mentioned previously, these events are not received by MDI child forms, so our existing methods will never be called.

Inside a namespace, identifiers declared within that namespace can be referred to directly, without any namespace qualification For example, within CounterNameSpace, the run( ) function can refer directly to lowerbound in the statement

A-1 B-1 C-1 D-1 G-1 Index-1

protected override void OnDeactivate(EventArgs e) { if (ctrlKeyHeld) ReleaseControlKey(); base.OnDeactivate(e); } protected override void OnActivated(EventArgs e) { // Update toggle toolbar button if required if (this._dlgPixel == null || _dlgPixel.IsDisposed) AssignPixelToggle(false); else AssignPixelToggle(_dlgPixel.Visible); base.OnActivated(e); }

if(count > lowerbound) return count--;

However, since namespace defines a scope, you need to use the scope resolution operator to refer to objects declared within a namespace from outside that namespace For example, to assign the value 10 to upperbound from code outside CounterNameSpace you must use this statement

As you may recall, we overrode the OnDeactivate method in earlier chapters to note that the Ctrl key should be released when the Form is no longer the active application on the desktop. We overrode the OnActivated method as part of the implementation for a toggle toolbar button tied to the PixelDlg form for the window. The deactivate logic is still required, since the Ctrl key is still a part of our MDI application. The pixel toggle button is not included in our current MDI application, so the activation logic is not required here. For the Ctrl key logic, we can duplicate the deactivation logic in an OnLeave method. This method, you may recall, is invoked when a control, in this case our form, loses focus. A standalone window, such as our SDI application, does not receive this event, so this addition has no effect on our SDI program.

CounterNameSpace::upperbound = 10;

1 Introduction Table I1 Meaning of Prefixs Table I2 Media Gigabyte Conversions Table I3 Notations Used in This Book 1 The Development of Blu-ray Disc Figure 11 Punched Card and Optical Disc 2 Technology Primer Figure 21 Optical Disc Pits Figure 22 Number Squares Figure 23 Optical Disc Layers Figure 24 Run-length Compression Example Figure 25 Color and Luminance Sensitivity of the Eye Figure 26 Block Transforms and Quantization Figure 27 Typical MPEG Picture Sequence Figure 28 MPEG Video Compression Example Figure 29 Frequency Masking and Hearing Threshold Figure 210 Effects of Interface Jitter Figure 211 Effects of Sampling Jitter Figure 212 TV Shape vs Movie Shape Figure 213 Peg and Hole Figure 214 Shrink the Peg Figure 215 Slice the Peg Figure 216 Squeeze the Peg Figure 217 Soft Matte Filming Figure 218 Pan and Scan Transfer Figure 219 The Anamorphic Process Figure 220 Aspect Ratios, Conversions, and Displays Figure 221 Wide (Full) Mode on a Widescreen TV Figure 222 Expand (Theater) Mode on Widescreen TV Figure 223 Opening the Frame from 185 to 178 Figure 224 Common Aspect Ratios Figure 225 Display Sizes at Equal Heights Figure 226 Relative Display Sizes for Letterbox Display Figure 227 Interlaced Scan and Progressive Scan Figure 228 Converting Film to Video Figure 229 DTV and HD Ready Logos Table 21 Image Data Stream Examples Table 22 Compression Ratios for Disc Technologies 3 Features Table 31 Hollywood Studio Requirements for Next-Generation Formats I-6 I-7 I-8 1-1 2-2 2-3 2-5 2-15 2-17 2-19 2-21 2-22 2-27 2-35 2-36 2-40 2-40 2-40 2-41 2-41 2-42 2-42 2-43 2-44 2-46 2-46 248 2-49 2-50 2-51 2-52 2-54 2-57 2-13 2-24 3-2

ENSURE THE CTRL KEY IS RELEASED WHEN AN MDI CHILD FORM LOSES FOCUS Action 1 In the MainForm.cs code window, override the OnLeave method to duplicate the logic from the OnDeactivate method for the MDI application. Result

Or, to declare an object of type counter from outside CounterNameSpace you will use a statement like this:

CounterNameSpace::counter ob;

protected override void OnLeave(EventArgs e) { if (IsMdiChild && ctrlKeyHeld) ReleaseControlKey(); base.OnLeave(e); }