Windows Programming Using C#

Transcription

1 Contents Windows Programming Using C# Menus TreeView TabControl MenuStrip 2 Main Menu Menus (mnu prefix) Menus provide groups of related commands for Windows applications Main menu is the control that resides upper section of the form. It provides easy access for frequently used operations. 3 separator bars Checked menu item 4 Menu Design Standards File Menu New (Ctrl N) Open (Ctrl O) Close Save As Save (Ctrl S) Print (Ctrl P) Exit Edit Menu Undo (Ctrl Z) Cut (Ctrl X) Copy (Ctrl C) Paste (Ctrl V) Find (Ctrl F) Replace (Ctrl H) Menus Pulldown menus «MenuStrip» a way to select commands and options Normally these are in a MenuStrip across the top of the application Begin by placing a MenuStrip across the application It displays boxes into which menu items and cascading menus can be typed 5 6 1

2 The MenuStrip Control The MenuStrip control is essentially a ToolStrip control optimized for the display of ToolStripMenu items. The MenuStrip control derives from ToolStrip and can host all the tool strip items described in the previous lesson. Its primary function, however, is to host ToolStripMenu items. ToolStripMenuItem controls are the controls that provide the visual representation for items on a menu. They can appear as text, an image, or both and can execute code found in their ToolStripMenuItem Adding Main Menu MainStrip is added to the form by dragging and dropping from. 7 8 Menus The MenuStrip Control The type here text allows new items to be added When you click on type here a pull down appears letting you select Menu item ComboBox Separator TextBox PROPERTY AllowMerge LayoutStyle ShowItemToolTips TextDirection DESCRIPTION Indicates whether this menu strip can be merged with another tool strip. Indicates how the controls on the tool strip are laid out Indicates whether tool tips for individual tool strip items are displayed. Indicates the direction of the text in controls hosted in the tool strip ToolStripMenuItem properties PROPERTY DESCRIPTION AutoSize Checked CheckOnClick CheckState DisplayStyle DoubleClickEnabled DropDownItems Determines whether the menu item is automatically sized to fit the text. Determines whether the menu item appears as selected. Determines whether the menu item is automatically selected when clicked Returns the CheckState value of the menu item. CheckState can be Checked, Unchecked, or Indeterminate. Determines how the tool strip menu item is displayed. Determines whether the DoubleClick event fires. Contains a collection of tool strip items (usually, but not necessarily, tool strip menu items) that appear in the drop-down list when this item is chosen. CREATING MENUS AND MENU ITEMS To create an access shortcut (or keyboard shortcut),

3 CREATING MENUS AND MENU ITEMS CREATING MENUS AND MENU ITEMS To add other shortcut keys (e.g., <Ctrl>-F9) To create an access shortcut (or keyboard shortcut), Adding Separator Bars to Menus You can add a separator to any submenu at design time by choosing Separator from the drop-down box in the menu item design interface. Using - MenuStrip and ToolStripMenuItem an event. Click Generated when an item is clicked or a shortcut key is used. This is the default event when the menu is double clicked in the designer DropDownOpened Occurs when Dropdown hasoopened 15 Slide 16 s and the ContextMenuStrip Control All controls that can display a context menu expose a ContextMenuStrip property that represents the context menu associated with that control A context menu is invoked when the user right-clicks a control. You can set this property at design time in the Properties window. with ContextMenuStrip into Form

4 ContextMenuStrip menu menu item Remove ContextMenu with ListBox ListBox ContextMenuStrip = ContextMenuStrip1 menu item context menu Click menu item Demo with user ListBox The StatusBar Control The ToolBar Control Alignment Buttons AutoSize ButtonClick Event BorderStyle ImageList Icon SendToBack() Method Style ShowToolTips ToolTipText

5 MenuItem Properties Checked if true displays check mark CheckOnClick check state changes when clicked CheckState one of CheckState.Checked CheckState.Unchecked CheckState.Indeterminate ShortcutKeys a member of the Shortcut enumeration indicating the shortcut key MenuItem Click event which is raised when the menu item is clicked Menu items are similar to buttons and are handled in the same way * see MenuDemo ComboBox Menu Items You can use a ComboBox as a menu item Use the designer to add a set of Items to the combo box You can then select a value The click event is raised only when you click on the selected value, not when you change the selection If you have nothing selected, the selected item will be null TreeView Presents a hierarchical tree view of the data Nodes can be Selected Expanded and collapsed Text of nodes can be edited Nodes can be added or deleted programmatically All nodes in the tree are instances of Constructors (string displaytext) Properties Nodes get Collection of all children of this node Text the displayed text Checked true if the node is checked FullPath the labels of all nodes from the root to this node separated by \\ NextNode returns next sibling PrevNode returns previous sibling Methods Collapse collapses the node

6 TreeView Expand expands the node ExpandAll expands all children of this node GetNodeCount returns the number of child nodes This is the actual control Properties Nodes get Collection of all children of this node CheckBoxes if true, displays checkboxes beside tree nodes SelectedNode the selected node LabelEdit if true, node text can be edited TreeView MenuStript DEMO Events AfterSelect after a node is selected AfterExpanded after a node is expanded AfterCollapsed after a node is collapsed AfterEdited after a node is edited