barcode generator source code in c#.net CUSTOM CONTROLS in Java

Generator ECC200 in Java CUSTOM CONTROLS

void corePart_MouseLeftButtonDown(object sender, MouseButtonEventArgs e) { isPressed = true; GoToState(true); } void corePart_MouseLeftButtonUp(object sender, MouseButtonEventArgs e) { isPressed = false; isCoolDown = true; pressedTime = DateTime.Now; GoToState(true); } 3. Next, wire up the handlers to the events. You can do this in the CorePart property s setter, as follows. Note that in the case where more than one template is applied, before wiring up the event handlers, you need to make sure to remove any existing event handlers.

private FrameworkElement CorePart { get { return corePart; } set { FrameworkElement oldCorePart = corePart; if (oldCorePart != null) { oldCorePart.MouseEnter -= new MouseEventHandler(corePart_MouseEnter); oldCorePart.MouseLeave -= new MouseEventHandler(corePart_MouseLeave); oldCorePart.MouseLeftButtonDown -= new MouseButtonEventHandler( corePart_MouseLeftButtonDown); oldCorePart.MouseLeftButtonUp -= new MouseButtonEventHandler( corePart_MouseLeftButtonUp); } corePart = value; if (corePart != null) { corePart.MouseEnter += new MouseEventHandler(corePart_MouseEnter); corePart.MouseLeave += new MouseEventHandler(corePart_MouseLeave);

corePart.MouseLeftButtonDown += new MouseButtonEventHandler( corePart_MouseLeftButtonDown); corePart.MouseLeftButtonUp += new MouseButtonEventHandler( corePart_MouseLeftButtonUp); } } } 4. Recall that when the button is clicked, you need to make sure the button is disabled for however many seconds are set as the cooldown period. To do this, first create a method that checks to see if the cooldown time has expired, as follows:

private bool CheckCoolDown() { if (!isCoolDown) { return false; } else { if (DateTime.Now > pressedTime.AddSeconds(CoolDownSeconds)) { isCoolDown = false; return false; } else { return true; } } } The logic behind this method is pretty simple. If the isCoolDown flag is true, then you are simply checking to see if the current time is greater than the pressedTime added to the cooldown. If so, you reset the isCoolDown flag and return false; otherwise, you return true. 5. Now you need to surround the code in each of the event handlers with a call to the CheckCoolDown() method, as follows. If the cooldown has not yet expired, none of the event handlers should perform any action.

void corePart_MouseEnter(object sender, MouseEventArgs e) { if (!CheckCoolDown()) { isMouseOver = true; GoToState(true); } } void corePart_MouseLeave(object sender, MouseEventArgs e)

{ if (!CheckCoolDown()) { isMouseOver = false; GoToState(true); } } void corePart_MouseLeftButtonDown(object sender, MouseButtonEventArgs e) { if (!CheckCoolDown()) { isPressed = true; GoToState(true); } } void corePart_MouseLeftButtonUp(object sender, MouseButtonEventArgs e) { if (!CheckCoolDown()) { isPressed = false; isCoolDown = true; pressedTime = DateTime.Now; GoToState(true); } } 6. Recall that in step 2 of the Defining Properties and States section, you created a method called OnCoolDownButtonChange(). At that time, you did not place anything in this method. This is the method that is called whenever there is a notification change to a dependency property. When a change occurs, you need to call GoToState() so the control can reflect the changes, as follows:

protected virtual void OnCoolDownButtonChange(RoutedEventArgs e) { GoToState(true); } 7. Next, create a constructor for your control and apply the default style key. In many cases, this will simply be the type of your control itself.

public CoolDownButtonControl() { DefaultStyleKey = typeof(CoolDownButtonControl); } 8. The final step in creating the control is to define a control contract that describes your control. This is required in order for your control to be modified by tools such as Expression Blend. This contract consists of a number of attributes that are placed directly in the control class, as follows. These attributes are used only by tools; they are not used by the runtime.

namespace CoolDownButton { [TemplatePart(Name = "Core", Type = typeof(FrameworkElement))] [TemplateVisualState(Name = "Normal", GroupName = "NormalStates")] [TemplateVisualState(Name = "MouseOver", GroupName = " NormalStates")] [TemplateVisualState(Name = "Pressed", GroupName = " NormalStates")] [TemplateVisualState(Name = "CoolDown", GroupName="CoolDownStates")] [TemplateVisualState(Name = "Available", GroupName="CoolDownStates")] public class CoolDownButtonControl : Control { } } This completes the creation of the custom control.