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drop-down lists that let you change the gradient colors and fill style, a Randomize Colors link that chooses random gradient colors, and some static information that indicates the control s current size and location. Additionally, there s a link for docking the control at the very bottom of the smart tag, which is thrown in for free because we re using the ParentControlDesigner (the natural control designer for control containers like Panel).

If this dirty block is selected by the key cache for purging meaning that it will be replaced by a more recently requested index block that block is flushed to disk before being replaced If the block is not dirty, it s simply thrown away in favor of the new block Figure 4-2 shows the flow request between user connections and the key cache for requests involving MyISAM tables, along with the relevant function calls in /mysys/mf_keycachec..

SQL>GRANT CONNECT TO "OPS$ACME\Edzehoo"

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Figure 26-4. A custom smart tag To create this smart tag, you need the following ingredients: A collection of DesignerActionItem objects. Each DesignerActionItem represents a single item in the smart tag. An action list class. This class has two roles it configures the collection of DesignerActionItem instances for the smart tag and, when a command or change is made, it performs the corresponding operation on the linked control. A control designer. This hooks your action list up to the control so the smart tag appears at design time. In the following sections, you ll build this solution piece-by-piece.

10. There is actually a BLOCK_TEMPERATURE variable, which places the block into warm or hot lists of blocks (enum BLOCK_TEMPERATURE { BLOCK_COLD, BLOCK_WARM , BLOCK_HOT }).

Creating a smart tag is conceptually similar to adding designer verbs you override a method in your control designer, and return a collection of commands you want to support. (This list of commands is called an action list.) However, smart tags allow many more options than designer verbs, and so the associated code is likely to be more complex. To keep it all under control, it s a good idea to separate your code by creating a custom class that encapsulates your action list. This custom class should derive from DesignerActionList (in the System.ComponentModel.Design namespace). Here s an example that creates an action list that s intended for use with the GradientPanel: public class GradientPanelActionList : DesignerActionList { ... }

Tip If you don t wish to use the SQL*Plus command line tool, you can also create the user using the Oracle Administration Assistant for Windows.

You should add a single constructor to the action list that requires the matching control type You can then store the reference to the control in a member variable This isn t required, because the base ActionList class does provide a Component property that provides access to your control However, by using this approach, you gain the convenience of strongly typed access to your control private GradientPanel linkedControl; public GradientPanelActionList(GradientPanel ctrl) : base(ctrl) { linkedControl = ctrl; } Before you can build the smart tag, you need to equip your action-list class with the required members For every link you want to add to the tag (via a DesignerActionMethodItem), you need to create a method For every property you want to add (via the DesignerActionPropertyItem), you need to create a property procedure.

Found block No found block read_block() found in /mysys/mf_keycache.c Read block from disk into key cache list of blocks

The smart tag in Figure 26-4 includes eight custom items: two category headers, three properties, one action link, and two pieces of static text (at the bottom of the tag) The first step is to add the properties The get property procedure needs to retrieve the value of the property from the linked control The set property procedure needs to apply the new value to the linked control However, there s a catch you can t set the new value directly If you do, other parts of the designer infrastructure won t be notified about the change Instead, you need to work through the PropertyDescriptorSetValue() method, as described in the previous section To make this easier, you can define a private helper method in your action-list class that retrieves the PropertyDescriptor for a given property by name: private PropertyDescriptor GetPropertyByName(string propName) { PropertyDescriptor prop; prop = TypeDescriptor.

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