Class ContentProposalAdapter

  • Direct Known Subclasses:
    ContentAssistCommandAdapter

    public class ContentProposalAdapter
    extends Object
    ContentProposalAdapter can be used to attach content proposal behavior to a control. This behavior includes obtaining proposals, opening a popup dialog, managing the content of the control relative to the selections in the popup, and optionally opening up a secondary popup to further describe proposals.

    A number of configurable options are provided to determine how the control content is altered when a proposal is chosen, how the content proposal popup is activated, and whether any filtering should be done on the proposals as the user types characters.

    This class provides some overridable methods to allow clients to manually control the popup. However, most of the implementation remains private.

    Since:
    3.2
    • Field Detail

      • DEBUG

        public static final boolean DEBUG
        Flag that controls the printing of debug info.
        See Also:
        Constant Field Values
      • PROPOSAL_INSERT

        public static final int PROPOSAL_INSERT
        Indicates that a chosen proposal should be inserted into the field.
        See Also:
        Constant Field Values
      • PROPOSAL_REPLACE

        public static final int PROPOSAL_REPLACE
        Indicates that a chosen proposal should replace the entire contents of the field.
        See Also:
        Constant Field Values
      • PROPOSAL_IGNORE

        public static final int PROPOSAL_IGNORE
        Indicates that the contents of the control should not be modified when a proposal is chosen. This is typically used when a client needs more specialized behavior when a proposal is chosen. In this case, clients typically register an IContentProposalListener so that they are notified when a proposal is chosen.
        See Also:
        Constant Field Values
      • FILTER_NONE

        public static final int FILTER_NONE
        Indicates that there should be no filter applied as keys are typed in the popup.
        See Also:
        Constant Field Values
      • FILTER_CHARACTER

        public static final int FILTER_CHARACTER
        Indicates that a single character filter applies as keys are typed in the popup.
        See Also:
        Constant Field Values
      • FILTER_CUMULATIVE

        @Deprecated
        public static final int FILTER_CUMULATIVE
        Deprecated.
        As of 3.4, filtering that is sensitive to changes in the control content should be performed by the supplied IContentProposalProvider, such as that performed by SimpleContentProposalProvider
        Indicates that a cumulative filter applies as keys are typed in the popup. That is, each character typed will be added to the filter.
        See Also:
        Constant Field Values
    • Constructor Detail

      • ContentProposalAdapter

        public ContentProposalAdapter​(Control control,
                                      IControlContentAdapter controlContentAdapter,
                                      IContentProposalProvider proposalProvider,
                                      KeyStroke keyStroke,
                                      char[] autoActivationCharacters)
        Construct a content proposal adapter that can assist the user with choosing content for the field.
        Parameters:
        control - the control for which the adapter is providing content assist. May not be null.
        controlContentAdapter - the IControlContentAdapter used to obtain and update the control's contents as proposals are accepted. May not be null.
        proposalProvider - the IContentProposalProvider used to obtain content proposals for this control, or null if no content proposal is available.
        keyStroke - the keystroke that will invoke the content proposal popup. If this value is null, then proposals will be activated automatically when any of the auto activation characters are typed.
        autoActivationCharacters - An array of characters that trigger auto-activation of content proposal. If specified, these characters will trigger auto-activation of the proposal popup, regardless of whether an explicit invocation keyStroke was specified. If this parameter is null, then only a specified keyStroke will invoke content proposal. If this parameter is null and the keyStroke parameter is null, then all alphanumeric characters will auto-activate content proposal.
    • Method Detail

      • getControl

        public Control getControl()
        Get the control on which the content proposal adapter is installed.
        Returns:
        the control on which the proposal adapter is installed.
      • getLabelProvider

        public ILabelProvider getLabelProvider()
        Get the label provider that is used to show proposals.
        Returns:
        the ILabelProvider used to show proposals, or null if one has not been installed.
      • isEnabled

        public boolean isEnabled()
        Return a boolean indicating whether the receiver is enabled.
        Returns:
        true if the adapter is enabled, and false if it is not.
      • setLabelProvider

        public void setLabelProvider​(ILabelProvider labelProvider)
        Set the label provider that is used to show proposals. The lifecycle of the specified label provider is not managed by this adapter. Clients must dispose the label provider when it is no longer needed.
        Parameters:
        labelProvider - the ILabelProvider used to show proposals.
      • getContentProposalProvider

        public IContentProposalProvider getContentProposalProvider()
        Return the proposal provider that provides content proposals given the current content of the field. A value of null indicates that there are no content proposals available for the field.
        Returns:
        the IContentProposalProvider used to show proposals. May be null.
      • setContentProposalProvider

        public void setContentProposalProvider​(IContentProposalProvider proposalProvider)
        Set the content proposal provider that is used to show proposals.
        Parameters:
        proposalProvider - the IContentProposalProvider used to show proposals
      • getAutoActivationCharacters

        public char[] getAutoActivationCharacters()
        Return the array of characters on which the popup is autoactivated.
        Returns:
        An array of characters that trigger auto-activation of content proposal. If specified, these characters will trigger auto-activation of the proposal popup, regardless of whether an explicit invocation keyStroke was specified. If this parameter is null, then only a specified keyStroke will invoke content proposal. If this value is null and the keyStroke value is null, then all alphanumeric characters will auto-activate content proposal.
      • setAutoActivationCharacters

        public void setAutoActivationCharacters​(char[] autoActivationCharacters)
        Set the array of characters that will trigger autoactivation of the popup.
        Parameters:
        autoActivationCharacters - An array of characters that trigger auto-activation of content proposal. If specified, these characters will trigger auto-activation of the proposal popup, regardless of whether an explicit invocation keyStroke was specified. If this parameter is null, then only a specified keyStroke will invoke content proposal. If this parameter is null and the keyStroke value is null, then all alphanumeric characters will auto-activate content proposal.
      • getAutoActivationDelay

        public int getAutoActivationDelay()
        Set the delay, in milliseconds, used before any autoactivation is triggered.
        Returns:
        the time in milliseconds that will pass before a popup is automatically opened
      • setAutoActivationDelay

        public void setAutoActivationDelay​(int delay)
        Set the delay, in milliseconds, used before autoactivation is triggered.
        Parameters:
        delay - the time in milliseconds that will pass before a popup is automatically opened
      • getProposalAcceptanceStyle

        public int getProposalAcceptanceStyle()
        Get the integer style that indicates how an accepted proposal affects the control's content.
        Returns:
        a constant indicating how an accepted proposal should affect the control's content. Should be one of PROPOSAL_INSERT, PROPOSAL_REPLACE, or PROPOSAL_IGNORE. (Default is PROPOSAL_INSERT).
      • setProposalAcceptanceStyle

        public void setProposalAcceptanceStyle​(int acceptance)
        Set the integer style that indicates how an accepted proposal affects the control's content.
        Parameters:
        acceptance - a constant indicating how an accepted proposal should affect the control's content. Should be one of PROPOSAL_INSERT, PROPOSAL_REPLACE, or PROPOSAL_IGNORE
      • getFilterStyle

        public int getFilterStyle()
        Return the integer style that indicates how keystrokes affect the content of the proposal popup while it is open.
        Returns:
        a constant indicating how keystrokes in the proposal popup affect filtering of the proposals shown. FILTER_NONE specifies that no filtering will occur in the content proposal list as keys are typed. FILTER_CHARACTER specifies the content of the popup will be filtered by the most recently typed character. FILTER_CUMULATIVE is deprecated and no longer recommended. It specifies that the content of the popup will be filtered by a string containing all the characters typed since the popup has been open. The default is FILTER_NONE.
      • setFilterStyle

        public void setFilterStyle​(int filterStyle)
        Set the integer style that indicates how keystrokes affect the content of the proposal popup while it is open. Popup-based filtering is useful for narrowing and navigating the list of proposals provided once the popup is open. Filtering of the proposals will occur even when the control content is not affected by user typing. Note that automatic filtering is not used to achieve content-sensitive filtering such as auto-completion. Filtering that is sensitive to changes in the control content should be performed by the supplied IContentProposalProvider.
        Parameters:
        filterStyle - a constant indicating how keystrokes received in the proposal popup affect filtering of the proposals shown. FILTER_NONE specifies that no automatic filtering of the content proposal list will occur as keys are typed in the popup. FILTER_CHARACTER specifies that the content of the popup will be filtered by the most recently typed character. FILTER_CUMULATIVE is deprecated and no longer recommended. It specifies that the content of the popup will be filtered by a string containing all the characters typed since the popup has been open.
      • getPopupSize

        public Point getPopupSize()
        Return the size, in pixels, of the content proposal popup.
        Returns:
        a Point specifying the last width and height, in pixels, of the content proposal popup.
      • setPopupSize

        public void setPopupSize​(Point size)
        Set the size, in pixels, of the content proposal popup. This size will be used the next time the content proposal popup is opened.
        Parameters:
        size - a Point specifying the desired width and height, in pixels, of the content proposal popup.
      • getPropagateKeys

        public boolean getPropagateKeys()
        Get the boolean that indicates whether key events (including auto-activation characters) received by the content proposal popup should also be propagated to the adapted control when the proposal popup is open.
        Returns:
        a boolean that indicates whether key events (including auto-activation characters) should be propagated to the adapted control when the proposal popup is open. Default value is true.
      • setPropagateKeys

        public void setPropagateKeys​(boolean propagateKeys)
        Set the boolean that indicates whether key events (including auto-activation characters) received by the content proposal popup should also be propagated to the adapted control when the proposal popup is open.
        Parameters:
        propagateKeys - a boolean that indicates whether key events (including auto-activation characters) should be propagated to the adapted control when the proposal popup is open.
      • getControlContentAdapter

        public IControlContentAdapter getControlContentAdapter()
        Return the content adapter that can get or retrieve the text contents from the adapter's control. This method is used when a client, such as a content proposal listener, needs to update the control's contents manually.
        Returns:
        the IControlContentAdapter which can update the control text.
      • setEnabled

        public void setEnabled​(boolean enabled)
        Set the boolean flag that determines whether the adapter is enabled.
        Parameters:
        enabled - true if the adapter is enabled and responding to user input, false if it is ignoring user input.
      • addContentProposalListener

        public void addContentProposalListener​(IContentProposalListener listener)
        Add the specified listener to the list of content proposal listeners that are notified when content proposals are chosen.
        Parameters:
        listener - the IContentProposalListener to be added as a listener. Must not be null. If an attempt is made to register an instance which is already registered with this instance, this method has no effect.
        See Also:
        IContentProposalListener
      • removeContentProposalListener

        public void removeContentProposalListener​(IContentProposalListener listener)
        Removes the specified listener from the list of content proposal listeners that are notified when content proposals are chosen.
        Parameters:
        listener - the IContentProposalListener to be removed as a listener. Must not be null. If the listener has not already been registered, this method has no effect.
        Since:
        3.3
        See Also:
        IContentProposalListener
      • addContentProposalListener

        public void addContentProposalListener​(IContentProposalListener2 listener)
        Add the specified listener to the list of content proposal listeners that are notified when a content proposal popup is opened or closed.
        Parameters:
        listener - the IContentProposalListener2 to be added as a listener. Must not be null. If an attempt is made to register an instance which is already registered with this instance, this method has no effect.
        Since:
        3.3
        See Also:
        IContentProposalListener2
      • removeContentProposalListener

        public void removeContentProposalListener​(IContentProposalListener2 listener)
        Remove the specified listener from the list of content proposal listeners that are notified when a content proposal popup is opened or closed.
        Parameters:
        listener - the IContentProposalListener2 to be removed as a listener. Must not be null. If the listener has not already been registered, this method has no effect.
        Since:
        3.3
        See Also:
        IContentProposalListener2
      • openProposalPopup

        protected void openProposalPopup()
        Open the proposal popup and display the proposals provided by the proposal provider. This method returns immediately. That is, it does not wait for a proposal to be selected. This method is used by subclasses to explicitly invoke the opening of the popup. If there are no proposals to show, the popup will not open and a beep will be sounded.
      • closeProposalPopup

        protected void closeProposalPopup()
        Close the proposal popup without accepting a proposal. This method returns immediately, and has no effect if the proposal popup was not open. This method is used by subclasses to explicitly close the popup based on additional logic.
        Since:
        3.3
      • hasProposalPopupFocus

        public boolean hasProposalPopupFocus()
        Returns whether the content proposal popup has the focus. This includes both the primary popup and any secondary info popup that may have focus.
        Returns:
        true if the proposal popup or its secondary info popup has the focus
        Since:
        3.4
      • setProposalPopupFocus

        public void setProposalPopupFocus()
        Sets focus to the proposal popup. If the proposal popup is not opened, this method is ignored. If the secondary popup has focus, focus is returned to the main proposal popup.
        Since:
        3.6
      • isProposalPopupOpen

        public boolean isProposalPopupOpen()
        Answers a boolean indicating whether the main proposal popup is open.
        Returns:
        true if the proposal popup is open, and false if it is not.
        Since:
        3.6
      • refresh

        public void refresh()
        Reloads the proposals from the content provider and fills them into the proposal pop-up, if the pop-up is currently open.
        Since:
        3.15