ASP.NET PDF Viewer using C#, VB/NET

We ll also add a label with the text &Due Date: followed by a DateTimePicker control, and finally another text box with a label of Descri&ption:. (Note that we ve been careful to avoid ambiguous access keys; Alt-D is for the due date, so we had to pick a different letter for the description Alt-P.) For the description, we d like the user to be able to write multiple lines of text, so we need to do two things. We need to set the AcceptsRe turn property to true this prevents the Return key from having the usual effect of clicking the form s default button, and lets the text box handle returns instead. We also need to set the Multiline property to true. These two properties may seem redundant, but sometimes it s useful to support multiple lines with word wrapping but still have the Return key click the default button, which is why these two aspects are separated out. In this application we need to set both. Finally, we need a couple of buttons one to add new items and one to delete items. We ll set the Text properties to &New and &Delete, once more taking care to keep access keys unique. Again, we want all our controls to have sensible names, so we ll go with titleText, dueDatePicker, descriptionText, newButton, and deleteButton for the various controls we ve just added. (The names of the Label controls are not so significant, as we won t be using them from the code behind, but out of a slightly obsessive sense of neatness we ll called those titleLabel, dueDateLabel, and descriptionLabel.) Figure 22-6 shows the work in progress.

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In fact, we re not quite done here because there s a problem when the user resizes the form. As Figure 22-7 shows, the ListView fills all the width, but the remaining controls have somewhat disappointing behavior. Fortunately, we can fix this.

Windows Forms controls support a couple of kinds of automatic resizing behavior. They can be docked we already have two docked controls, in fact. The SplitCon tainer is docked to fill the entire form, and the ListView is docked to fill the top half of the SplitContainer. If you edit the Dock property with the Properties window (instead of the Task pop up we used earlier) you can also dock controls to a particular edge of their container, rather than having to fill the whole thing this is useful for menus and toolbars that need to appear along the top edge of a window. The other form of automatic resizing is anchoring. An anchored control doesn t have to fill the whole width and/or height of its container, but instead can resize or move as its container resizes. You can anchor the top, left, bottom, or right of any control to the corresponding edge of its container. In fact, by default, controls are anchored to the top and left sides of their container this means that when the container (e.g., the window) moves, the contained controls go with it, but if the user resizes the window by moving either the right or bottom edge, the controls remain as they are.

keyReleaseEvent. You usually cannot rely on seeing the keyReleaseEvent the user might move the focus between widgets (using the mouse) before releasing the key. If you need to ensure that your widget gets all keyboard events, use the grabKeyboard and releaseKeyboard methods. When a widget grabs the keyboard, all key events are sent to it regardless of which widget currently has the focus. The event handler in the listing shows modifier keys and the text of the pressed key. The modifiers are stored as a bit mask, and several can be active at once. Listing 6-12. A keyboard event handling method void EventWidget::keyPressEvent( QKeyEvent * event ) { emit gotEvent( QString("keyPressEvent( text:%1, modifiers:%2 )") .arg( event->text() ) .arg( event->modifiers()==0 tr("NoModifier"):( (event->modifiers() & Qt::ShiftModifier ==0 tr(""): tr("ShiftModifier "))+ (event->modifiers() & Qt::ControlModifier ==0 tr(""): tr("ControlModifier "))+ (event->modifiers() & Qt::AltModifier ==0 tr(""): tr("AltModifier "))+ (event->modifiers() & Qt::MetaModifier ==0 tr(""): tr("MetaModifier "))+ (event->modifiers() & Qt::KeypadModifier ==0 tr(""): tr("KeypadModifier "))+ (event->modifiers()&Qt::GroupSwitchModifier ==0 tr(""): tr("GroupSwitchModifier")) ) ) ); }

We can exploit this to make our controls resize. The Title text box and the date picker should both be anchored to the top, left, and right, as shown in Figure 22-8. So as the window changes width, the righthand edge of these controls will follow its righthand edge. The Description text box should be anchored on all four sides, so it resizes both vertically and horizontally.

You attach a hoverBehavior element to this control and implement actions for <hover> and <unhover> These actions then simply call the show and hide methods of the <popupBehavior> to make it appear and disappear when hovering over and hovering off, respectively..

The two buttons should be anchored only on the bottom and right, meaning you need to unanchor them from the top and left. That s because we want them to follow the bottom-right corner of the window, but not to resize. With these changes in place, the user interface will now resize gracefully as the user resizes the window or adjusts the splitter. Good though that looks, our application doesn t do anything yet. So the next step will be to hook up the controls to the data.