ListBox. Class ListBoxTest. Allows users to add and remove items from ListBox Uses event handlers to add to, remove from, and clear list
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1 C# cont d (C-sharp) (many of these slides are extracted and adapted from Deitel s book and slides, How to Program in C#. They are provided for CSE3403 students only. Not to be published or publicly distributed without permission by the publisher). 1
2 ListBox Class ListBoxTest Allows users to add and remove items from ListBox Uses event handlers to add to, remove from, and clear list 2
3 ListBox ListBox properties, methods and events Common Properties Items MultiColumn SelectedIndex SelectedIndices SelectedItem SelectedItems SelectionMode Sorted Common Method Description / Delegate and Event Arguments Lists the collection of items within the ListBox. Indicates whether the ListBox can break a list into multiple columns. M ultiple columns are used to make vertical scroll bars unnecessary. Returns the index of the currently selected item. If the user selects multiple items, this method arbitrarily returns one of the selected indices; if no items have been selected, the method returns -1. Returns a collection of the indices of all currently selected items. Returns a reference to the currently selected item (if multiple items are selected, it returns the item with the lowest index number). Returns a collection of the currently selected item(s). Determines the number of items that can be selected and the means through which multiple items can be selected. Values None, One, MultiSimple (multiple selection allowed) and MultiExtended (multiple selection allowed via a combination of arrow keys, mouse clicks and Shift and Control buttons). Indicates whether items appear in alphabetical order. True causes alphabetization; default is False. But, does not sort the list. (to sort the list, transfer the items into another list (e.g., an array), sort that list and then re-insert them into the ListBox). 3
4 Example.. ListBox entering items Type your items (strings) here. 4
5 .. After entering the items The actual GUI running The Form in VS designer. 5
6 Finalized GUI 1. Type an item in the textbox 2. Press the Add button 3. The item is added to the list. 6
7 Finalized GUI Click the Remove button to remove an item (but must have selected first). 7
8 Finalized GUI 1. Select an item 2. Press the Remove button. 3. The item has been removed 8
9 using System; using System.Drawing; using System.Collections; using System.ComponentModel; using System.Windows.Forms; using System.Data; The code namespace WindowsApplication5_1ListBox / <summary> / Summary description for Form1. / </summary> public class Form1 : System.Windows.Forms.Form private System.Windows.Forms.ListBox listbox1; private System.Windows.Forms.TextBox textbox1; private System.Windows.Forms.Label label1; private System.Windows.Forms.Button button1; private System.Windows.Forms.Button button2; private System.Windows.Forms.Button button3; private System.Windows.Forms.Button button4; / <summary> / Required designer variable. / </summary> private System.ComponentModel.Container components = null; 9
10 private void InitializeComponent() this.listbox1 = new System.Windows.Forms.ListBox(); this.textbox1 = new System.Windows.Forms.TextBox(); this.label1 = new System.Windows.Forms.Label(); this.button1 = new System.Windows.Forms.Button(); this.button2 = new System.Windows.Forms.Button(); this.button3 = new System.Windows.Forms.Button(); this.button4 = new System.Windows.Forms.Button(); this.suspendlayout(); listbox1 this.listbox1.items.addrange(new object[] "one of nine", "two of nine", "three of nine", "four of nine", Adding the items to the listbox "five of nine", "six of nine", "seven of nine", "eight of nine", "nine of nine"); 10
11 ... this.button1.text = "Add"; this.button1.click += new System.EventHandler(this.button1_Click);... this.button2.text = "Remove"; this.button2.click += new System.EventHandler(this.button2_Click);... this.button3.text = "Clear"; this.button3.click += new System.EventHandler(this.button3_Click);... this.button4.text = "Exit"; this.button4.click += new System.EventHandler(this.button4_Click);... static void Main() Application.Run(new Form1()); 11
12 private void button1_click(object sender, System.EventArgs e) listbox1.items.add(textbox1.text); / private void button2_click(object sender, System.EventArgs e) Some item is selected if (listbox1.selectedindex!= -1) listbox1.items.remove(listbox1.selecteditem); else MessageBox.Show("Please select an item first"); private void button3_click(object sender, System.EventArgs e) listbox1.items.clear(); private void button4_click(object sender, System.EventArgs e) Application.Exit(); Remove ALL the items from the list. 12
13 CheckedListBox CheckedListBox derives from class ListBox Can add to, remove from or clear list Can select multiple items from the list Properties CurrentValue and NewValue return state of object selected Properties CheckedItems and CheckedIndices return the objects and indices of selected items respectively 13
14 CheckListBox CheckedListBox properties, methods and events Common Properties CheckedItems CheckedIndices SelectionMode Common Methods GetItemChecked Common Events ItemCheck ItemCheckEventArgs Properties CurrentValue Index NewValue Description / Delegate and Event Arguments (All the ListBox properties and events are inherited by CheckedListBox.) The collection of items that are checked. Not the same as the selected items, which are highlighted (but not necessarily checked). Returns indices for the items that are checked. Not the same as the selected indices. Can only have values One (allows multiple selection) or None (does not allow multiple selection). Takes an index and returns true if corresponding item checked. (Delegate ItemCheckEventHandler, event arguments ItemCheckEventArgs) Raised when an item is checked or unchecked. Whether current item is checked or unchecked. Values Checked, Unchecked or Indeterminate. Index of item that changed. New state of item. CheckedListBox properties, methods and events. 14
15 .. After entering the items The actual GUI running The Form in VS designer. 15
16 The items in CkeckedListBoxes have two modes selected and checked. On 1 st click on an item, the item is highlighted (selected); on 2 nd click, the item is checked. (if an item is being selected but not yet checked, it is said to be in intermediate mode). Selected item. This item sustained only one click so far. (it will become checked on a subsequent consecutive click). Checked item (this item sustained two consecutive clicks). 16
17 Demo of the GUI These items are checked in the CheckedListBox, in the order that they appear in this list. Initial display. No items are selected. Several items have been selected and as they were checked they added to the list on the right. 4 of 9 missing.. Item 4 of 9 has been unchecked in the CheckedListBox and as a result it was removed from the list on the right. 17
18 using System; using System.Drawing; using System.Collections; using System.ComponentModel; using System.Windows.Forms; using System.Data; The code namespace WindowsApplication5_2CheckedListBox / <summary> / Summary description for Form1. / </summary> public class Form1 : System.Windows.Forms.Form private System.Windows.Forms.CheckedListBox checkedlistbox1; private System.Windows.Forms.ListBox listbox1; private System.Windows.Forms.Label label1; / <summary> / Required designer variable. / </summary> private System.ComponentModel.Container components = null; public Form1() Required for Windows Form Designer support InitializeComponent(); TODO: Add any constructor code after InitializeComponent call 18
19 private void InitializeComponent() Add items to the CkeckedBoxList checkedlistbox1 this.checkedlistbox1.items.addrange(new object[] "1 of 9", "2 of 9", "3 of 9", "4 of 9", "5 of 9", "6 of 9","7 of 9", "8 of 9","9 of 9"); this.checkedlistbox1.itemcheck += new System.Windows.Forms.ItemCheckEventHandler(this.checkedListBox1_ItemCheck); / static void Main() If item is checked in the CkeckedBoxList, then add it to the ListBox; if item becomes unchecked in the Application.Run(new Form1()); CheckedBoxList, then remove it from the ListBox. private void checkedlistbox1_itemcheck(object sender, System.Windows.Forms.ItemCheckEventArgs e) string s = checkedlistbox1.selecteditem.tostring(); if (e.newvalue == CheckState.Checked) listbox1.items.add(s); else listbox1.items.remove(s); 19
20 ComboBoxes Combine TextBox and drop-down list Add method adds object to collection Properties: Items: returns objects in the list SelectedItem: returns object selected SelectedIndex: returns index of selected item (the first item has index 0). 20
21 Example.. 21
22 using System; using System.Drawing; using System.Collections; using System.ComponentModel; using System.Windows.Forms; using System.Data; The code namespace WindowsApplication5_3Combo / <summary> / Summary description for Form1. / </summary> public class Form1 : System.Windows.Forms.Form private System.Windows.Forms.ComboBox combobox1; private System.Windows.Forms.Label label1; public Form1() Required for Windows Form Designer support InitializeComponent(); TODO: Add any constructor code after InitializeComponent call / <summary> / Clean up any resources being used. / </summary> protected override void Dispose( bool disposing ) base.dispose( disposing ); 22
23 private void InitializeComponent() this.combobox1 = new System.Windows.Forms.ComboBox(); this.label1 = new System.Windows.Forms.Label(); this.suspendlayout(); combobox1 this.combobox1.items.addrange(new object[] "Item 0 of 5", Add items to combo box "Item 1 of 5", "Item 2 of 5", "Item 3 of 5", "Item 4 of 5", "Item 5 of 5"); this.combobox1.location = new System.Drawing.Point(40, 24); this.combobox1.name = "combobox1"; this.combobox1.size = new System.Drawing.Size(121, 21); this.combobox1.tabindex = 0; this.combobox1.text = "combobox1"; this.combobox1.selectedindexchanged += new System.EventHandler(this.comboBox1_SelectedIndexChanged); 23
24 label1 this.label1.backcolor = System.Drawing.Color.Yellow; this.label1.font = new System.Drawing.Font("Arial", 9.75F, ((System.Drawing.FontStyle)((System.Drawing.FontStyle.Bold System.Drawing.FontStyle.Italic))), System.Drawing.GraphicsUnit.Point, ((System.Byte)(161))); this.label1.location = new System.Drawing.Point(24, 136); this.label1.name = "label1"; this.label1.size = new System.Drawing.Size(160, 23); this.label1.tabindex = 1; this.label1.text = "label1"; this.label1.textalign = System.Drawing.ContentAlignment.MiddleCenter; Form1 this.allowdrop = true; this.autoscalebasesize = new System.Drawing.Size(5, 13); this.clientsize = new System.Drawing.Size(208, 205); this.controls.add(this.label1); this.controls.add(this.combobox1); this.name = "Form1"; this.text = "Form1"; this.resumelayout(false); #endregion / <summary> / The main entry point for the application. / </summary> [STAThread] static void Main() Application.Run(new Form1()); 24
25 private void combobox1_selectedindexchanged(object sender, System.EventArgs e) if ( combobox1.selectedindex == 0) label1.text = "ZERO of 5 selected"; if (combobox1.selectedindex == 1) label1.text = "ONE of 5 selected"; if (combobox1.selectedindex == 2) label1.text = "TWO of 5 selected"; if (combobox1.selectedindex == 3) label1.text = "THREE of 5 selected"; if (combobox1.selectedindex == 4) label1.text = "FOUR of 5 selected"; if (combobox1.selectedindex == 5) label1.text = "FIVE of 5 selected"; / 25
26 ComboBoxes ComboBox events and properties Common Properties DropDownStyle Items MaxDropDownItems SelectedIndex SelectedItem Sorted Common Events Description / Delegate and Event Arguments Determines the type of combo box. Value Simple means that the text portion is editable and the list portion is always visible. Value DropDown (the default) means that the text portion is editable but an arrow button must be clicked to see the list portion. Value DropDownList means that the text portion is not editable and the arrow button must be clicked to see the list portion. Collection of items in the ComboBox control. Maximum number of items to display in the drop-down list (between 1 and 100). If value is exceeded, a scroll bar appears. Returns index of currently selected item. If there is no currently selected item, -1 is returned. Returns reference to currently selected item. If true, items appear in alphabetical order. Default false. (Delegate EventHandler, event arguments EventArgs) SelectedIndexChanged Raised when selected index changes (i.e., a check box has been checked or unchecked). Default when control double-clicked in designer. ComboBox properties and events. 26
27 TreeView Displays nodes hierarchically Parent nodes have children The first parent node is called the root (there can be many roots). Use Add method to add nodes 27
28 Designer view Tree Node Editor 28
29 Example 29
30 Example A selected (highlighted) node is printed on the label. The Expand All button causes the tree to expand (and the Collapse All button causes the tree to collapse.) 30
31 Example The Tree Size button click prints the number of nodes of the tree in the label. 31
32 Example The List Nodes button allows to traverse the tree (recursively) and print out its nodes. 32
33 using System; using System.Drawing; using System.Collections; using System.ComponentModel; using System.Windows.Forms; using System.Data; The code namespace WindowsApplication5_4TreeView / <summary> / Summary description for Form1. / </summary> public class Form1 : System.Windows.Forms.Form private System.Windows.Forms.TreeView treeview1; private System.Windows.Forms.Label label1; private System.Windows.Forms.Button expandbutton; private System.Windows.Forms.Button collapsebutton; private System.Windows.Forms.Button treesizebutton; private System.Windows.Forms.Button listnodesbutton; / <summary> / Required designer variable. / </summary> private System.ComponentModel.Container components = null; public Form1() Required for Windows Form Designer support InitializeComponent(); TODO: Add any constructor code after InitializeComponent call 33
34 private void InitializeComponent() this.treeview1 = new System.Windows.Forms.TreeView(); this.label1 = new System.Windows.Forms.Label(); this.expandbutton = new System.Windows.Forms.Button(); this.collapsebutton = new System.Windows.Forms.Button(); this.treesizebutton = new System.Windows.Forms.Button(); this.listnodesbutton = new System.Windows.Forms.Button(); this.suspendlayout(); treeview1 this.treeview1.imageindex = -1; this.treeview1.location = new System.Drawing.Point(16, 16); this.treeview1.name = "treeview1"; Populate the Tree with nodes. this.treeview1.nodes.addrange(new System.Windows.Forms.TreeNode[] new System.Windows.Forms.TreeNode("R.1", new System.Windows.Forms.TreeNode[] new System.Windows.Forms.TreeNode("C.11"), new System.Windows.Forms.TreeNode("C.12", new System.Windows.Forms.TreeNode[] new System.Windows.Forms.TreeNode("Node4")), new System.Windows.Forms.TreeNode("C.13")), new System.Windows.Forms.TreeNode("R.2", new System.Windows.Forms.TreeNode[] new System.Windows.Forms.TreeNode("C.21", new System.Windows.Forms.TreeNode[] new System.Windows.Forms.TreeNode("C.211"), new System.Windows.Forms.TreeNode("C.212")), new System.Windows.Forms.TreeNode("C.22"))); this.treeview1.selectedimageindex = -1; this.treeview1.size = new System.Drawing.Size(160, 120); this.treeview1.tabindex = 0; this.treeview1.afterselect += new System.Windows.Forms.TreeViewEventHandler(this.treeView1_AfterSelect); 34
35 this.expandbutton.click += new System.EventHandler(this.expandButton_Click); this.collapsebutton.click += new System.EventHandler(this.collapseButton_Click); this.treesizebutton.click += new System.EventHandler(this.treeSizeButton_Click); this.listnodesbutton.click += new System.EventHandler(this.listNodesButton_Click); static void Main() Application.Run(new Form1()); private void treeview1_afterselect(object sender, System.Windows.Forms.TreeViewEventArgs e) label1.text = treeview1.selectednode.tostring(); private void collapsebutton_click(object sender, System.EventArgs e) treeview1.collapseall(); private void expandbutton_click(object sender, System.EventArgs e) treeview1.expandall(); private void treesizebutton_click(object sender, System.EventArgs e) int treesize = treeview1.getnodecount(true); label1.text = "This tree has " + treesize + " nodes."; 35
36 private void listnodesbutton_click(object sender, System.EventArgs e) TreeNodeCollection mytreenodecollection = treeview1.nodes; IEnumerator myenumerator = mytreenodecollection.getenumerator(); label1.text = ""; while (myenumerator.movenext()) label1.text += " - " + ((TreeNode)myEnumerator.Current).Text; get the children of current node ProcessChildren( (TreeNode)myEnumerator.Current) ; / TreeView.Nod es gives only the nodes of the current level. To get the nodes of the next level, you need to call Nodes again. private void ProcessChildren( TreeNode anode) get children of anode into an enumerator IEnumerator childrenenumerator = anode.nodes.getenumerator(); if (anode.nodes.count == 0) return; while ( childrenenumerator.movenext() ) label1.text += " - " + ((TreeNode)childrenEnumerator.Current).Text; ProcessChildren( (TreeNode)childrenEnumerator.Current ); Recursive call (process the children of the current node). If there are no more nodes in the enumerator, then exit this call. process the children nodes. 36
37 Extracting the file system structure 37
38 38
39 / 39
40 private void filesystembutton_click(object sender, System.EventArgs e) treeview2.nodes.add( "E:\\2560"); string currentdirectory = "E:\\2560"; string [] subdirectories = Directory.GetDirectories(currentDirectory); foreach (string directory in subdirectories ) ProcessDirectories(directory, treeview2.nodes[0]); The related code../ private void ProcessDirectories ( string currentdirectory, TreeNode parent) string [] subdirectories = Directory.GetDirectories(currentDirectory); foreach (string dir in subdirectories ) TreeNode mynode = new TreeNode( dir); parent.nodes.add( mynode); ProcessDirectories( dir, mynode); 40
41 TreeView properties and events Common Properties CheckBoxes ImageList Nodes TreeView Description / Delegate and Event Arguments Indicates whether checkboxes appear next to nodes. True displays checkboxes. Default is False. Indicates the ImageList used to display icons by the nodes. An ImageList is a collection that contains a number of Image objects. Lists the collection of TreeNodes in the control. Contains methods Add (adds a TreeNode object), Clear (deletes the entire collection) and Remove (deletes a specific node). Removing a parent node deletes all its children. SelectedNode Currently selected node. Common Event AfterSelect (Delegate TreeViewEventHandler, event arguments TreeViewEventArgs) Generated after selected node changes. Default when double-clicked in designer. TreeView properties and events. 41
42 TreeView / TreeNode properties and methods Common Properties Checked FirstNode FullPath ImageIndex LastNode NextNode Nodes PrevNode SelectedImageI ndex Text Common Methods Collapse Expand ExpandAll GetNodeCount Description / Delegate and Event Arguments Indicates whether the TreeNode is checked. (CheckBoxes property must be set to True in parent TreeView.) Specifies the first node in the Nodes collection (i.e., first child in tree). Indicates the path of the node, starting at the root of the tree. Specifies the index of the image to be shown when the node is deselected. Specifies the last node in the Nodes collection (i.e., last child in tree). Next sibling node. The collection of TreeNodes contained in the current node (i.e., all the children of the current node). Contains methods Add (adds a TreeNode object), Clear (deletes the entire collection) and Remove (deletes a specific node). Removing a parent node deletes all its children. Indicates the previous sibling node. Specifies the index of the image to use when the node is selected. Specifies the text to display in the TreeView. Collapses a node. Expands a node. Expands all the children of a node. Returns the number of child nodes. TreeNode properties and methods. 42
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