/*******************************************************************************
 * Copyright (c) 2000, 2008 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 * Port to the D programming language:
 *     Frank Benoit <benoit@tionex.de>
 *******************************************************************************/
module org.eclipse.swt.widgets.TrayItem;

import java.lang.all;

import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.Tray;
import org.eclipse.swt.widgets.ToolTip;
import org.eclipse.swt.widgets.ImageList;
import org.eclipse.swt.widgets.Item;
import org.eclipse.swt.events.SelectionListener;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.events.MenuDetectListener;
import org.eclipse.swt.widgets.TypedListener;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.graphics.Region;
import org.eclipse.swt.internal.gtk.OS;

version(Tango){
    import tango.util.Convert;
} else { // Phobos
    import std.conv;
}

/**
 * Instances of this class represent icons that can be placed on the
 * system tray or task bar status area.
 * <p>
 * <dl>
 * <dt><b>Styles:</b></dt>
 * <dd>(none)</dd>
 * <dt><b>Events:</b></dt>
 * <dd>DefaultSelection, MenuDetect, Selection</dd>
 * </dl>
 * </p><p>
 * IMPORTANT: This class is <em>not</em> intended to be subclassed.
 * </p>
 *
 * @see <a href="http://www.eclipse.org/swt/snippets/#tray">Tray, TrayItem snippets</a>
 * @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a>
 *
 * @since 3.0
 */
public class TrayItem : Item {
    Tray parent;
    ToolTip toolTip;
    String toolTipText;
    GtkWidget* imageHandle;
    GtkWidget* tooltipsHandle;
    ImageList imageList;

/**
 * Constructs a new instance of this class given its parent
 * (which must be a <code>Tray</code>) and a style value
 * describing its behavior and appearance. The item is added
 * to the end of the items maintained by its parent.
 * <p>
 * The style value is either one of the style constants defined in
 * class <code>SWT</code> which is applicable to instances of this
 * class, or must be built by <em>bitwise OR</em>'ing together
 * (that is, using the <code>int</code> "|" operator) two or more
 * of those <code>SWT</code> style constants. The class description
 * lists the style constants that are applicable to the class.
 * Style bits are also inherited from superclasses.
 * </p>
 *
 * @param parent a composite control which will be the parent of the new instance (cannot be null)
 * @param style the style of control to construct
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_NULL_ARGUMENT - if the parent is null</li>
 * </ul>
 * @exception SWTException <ul>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent</li>
 *    <li>ERROR_INVALID_SUBCLASS - if this class is not an allowed subclass</li>
 * </ul>
 *
 * @see SWT
 * @see Widget#checkSubclass
 * @see Widget#getStyle
 */
public this (Tray parent, int style) {
    super (parent, style);
    this.parent = parent;
    createWidget (parent.getItemCount ());
}

/**
 * Adds the listener to the collection of listeners who will
 * be notified when the platform-specific context menu trigger
 * has occurred, by sending it one of the messages defined in
 * the <code>MenuDetectListener</code> interface.
 *
 * @param listener the listener which should be notified
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
 * </ul>
 * @exception SWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 *
 * @see MenuDetectListener
 * @see #removeMenuDetectListener
 *
 * @since 3.3
 */
public void addMenuDetectListener (MenuDetectListener listener) {
    checkWidget ();
    if (listener is null) error (SWT.ERROR_NULL_ARGUMENT);
    TypedListener typedListener = new TypedListener (listener);
    addListener (SWT.MenuDetect, typedListener);
}

/**
 * Adds the listener to the collection of listeners who will
 * be notified when the receiver is selected by the user, by sending
 * it one of the messages defined in the <code>SelectionListener</code>
 * interface.
 * <p>
 * <code>widgetSelected</code> is called when the receiver is selected
 * <code>widgetDefaultSelected</code> is called when the receiver is double-clicked
 * </p>
 *
 * @param listener the listener which should be notified when the receiver is selected by the user
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
 * </ul>
 * @exception SWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 *
 * @see SelectionListener
 * @see #removeSelectionListener
 * @see SelectionEvent
 */
public void addSelectionListener(SelectionListener listener) {
    checkWidget ();
    if (listener is null) error (SWT.ERROR_NULL_ARGUMENT);
    TypedListener typedListener = new TypedListener (listener);
    addListener (SWT.Selection, typedListener);
    addListener (SWT.DefaultSelection, typedListener);
}

protected override void checkSubclass () {
    if (!isValidSubclass ()) error (SWT.ERROR_INVALID_SUBCLASS);
}

override void createWidget (int index) {
    super.createWidget (index);
    parent.createItem (this, index);
}

override void createHandle (int index) {
    state |= HANDLE;
    handle = OS.gtk_plug_new (0);
    if (handle is null) error (SWT.ERROR_NO_HANDLES);
    imageHandle = OS.gtk_image_new ();
    if (imageHandle is null) error (SWT.ERROR_NO_HANDLES);
    OS.gtk_container_add (cast(GtkContainer*)handle, imageHandle);
    OS.gtk_widget_show (handle);
    OS.gtk_widget_show (imageHandle);
    auto id = OS.gtk_plug_get_id (cast(GtkPlug*)handle);
    int monitor = 0;
    auto screen = OS.gdk_screen_get_default ();
    if (screen !is null) {
        monitor = OS.gdk_screen_get_number (screen);
    }
    auto trayAtom = OS.gdk_atom_intern (toStringz("_NET_SYSTEM_TRAY_S" ~ to!(String)(monitor)), true);
    auto xTrayAtom = OS.gdk_x11_atom_to_xatom (trayAtom);
    auto xDisplay = OS.GDK_DISPLAY ();
    auto trayWindow = OS.XGetSelectionOwner (xDisplay, xTrayAtom);
    auto messageAtom = OS.gdk_atom_intern (toStringz("_NET_SYSTEM_TRAY_OPCODE"), true);
    auto xMessageAtom = OS.gdk_x11_atom_to_xatom (messageAtom);
    XClientMessageEvent* event = cast(XClientMessageEvent*)OS.g_malloc (XClientMessageEvent.sizeof);;
    event.type = OS.ClientMessage;
    event.window = trayWindow;
    event.message_type = xMessageAtom;
    event.format = 32;
    event.data.l [0] = OS.GDK_CURRENT_TIME;
    event.data.l [1] = OS.SYSTEM_TRAY_REQUEST_DOCK;
    event.data.l [2] = id;
    OS.XSendEvent (xDisplay, trayWindow, false, OS.NoEventMask, cast(XEvent*) event);
    OS.g_free (event);
}

override void deregister () {
    super.deregister ();
    display.removeWidget (imageHandle);
}

override void destroyWidget () {
    parent.destroyItem (this);
    releaseHandle ();
}

/**
 * Returns the receiver's parent, which must be a <code>Tray</code>.
 *
 * @return the receiver's parent
 *
 * @exception SWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 *
 * @since 3.2
 */
public Tray getParent () {
    checkWidget ();
    return parent;
}

/**
 * Returns the receiver's tool tip, or null if it has
 * not been set.
 *
 * @return the receiver's tool tip text
 *
 * @exception SWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 *
 * @since 3.2
 */
public ToolTip getToolTip () {
    checkWidget ();
    return toolTip;
}

/**
 * Returns the receiver's tool tip text, or null if it has
 * not been set.
 *
 * @return the receiver's tool tip text
 *
 * @exception SWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 */
public String getToolTipText () {
    checkWidget ();
    return toolTipText;
}

override int /*long*/ gtk_button_press_event (GtkWidget* widget, GdkEventButton* event) {
    if (event.type is OS.GDK_3BUTTON_PRESS) return 0;
    if (event.button is 3 && event.type is OS.GDK_BUTTON_PRESS) {
        sendEvent (SWT.MenuDetect);
        return 0;
    }
    if (event.type is OS.GDK_2BUTTON_PRESS) {
        postEvent (SWT.DefaultSelection);
    } else {
        postEvent (SWT.Selection);
    }
    return 0;
}

override int /*long*/ gtk_size_allocate (GtkWidget* widget, int /*long*/ allocation) {
    if (image !is null && image.mask !is null) {
        if (OS.gdk_drawable_get_depth (image.mask) is 1) {
            int xoffset = cast(int) Math.floor (OS.GTK_WIDGET_X (widget) + ((OS.GTK_WIDGET_WIDTH (widget) - OS.GTK_WIDGET_REQUISITION_WIDTH (widget)) * 0.5) + 0.5);
            int yoffset = cast(int) Math.floor (OS.GTK_WIDGET_Y (widget) + ((OS.GTK_WIDGET_HEIGHT (widget) - OS.GTK_WIDGET_REQUISITION_HEIGHT (widget)) * 0.5) + 0.5);
            Rectangle b = image.getBounds();
            auto gdkImage = OS.gdk_drawable_get_image (image.mask, 0, 0, b.width, b.height);
            if (gdkImage is null) SWT.error(SWT.ERROR_NO_HANDLES);
            byte[] maskData = (cast(byte*)gdkImage.mem)[ 0 .. gdkImage.bpl * gdkImage.height].dup;
            Region region = new Region (display);
            for (int y = 0; y < b.height; y++) {
                for (int x = 0; x < b.width; x++) {
                    int index = (y * gdkImage.bpl) + (x >> 3);
                    int theByte = maskData [index] & 0xFF;
                    int mask = 1 << (x & 0x7);
                    if ((theByte & mask) !is 0) {
                        region.add (xoffset + x, yoffset + y, 1, 1);
                    }
                }
            }
            OS.g_object_unref (gdkImage);
            OS.gtk_widget_realize (handle);
            auto window = OS.GTK_WIDGET_WINDOW (handle);
            OS.gdk_window_shape_combine_region (window, region.handle, 0, 0);
            region.dispose ();
        }
    }
    return 0;
}

override void hookEvents () {
    int eventMask = OS.GDK_BUTTON_PRESS_MASK;
    OS.gtk_widget_add_events (handle, eventMask);
    OS.g_signal_connect_closure_by_id (handle, display.signalIds [BUTTON_PRESS_EVENT], 0, display.closures [BUTTON_PRESS_EVENT], false);
    OS.g_signal_connect_closure_by_id (imageHandle, display.signalIds [SIZE_ALLOCATE], 0, display.closures [SIZE_ALLOCATE], false);
 }

/**
 * Returns <code>true</code> if the receiver is visible and
 * <code>false</code> otherwise.
 *
 * @return the receiver's visibility
 *
 * @exception SWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 */
public bool getVisible () {
    checkWidget ();
    return OS.GTK_WIDGET_VISIBLE (handle);
}

override void register () {
    super.register ();
    display.addWidget (imageHandle, this);
}

override void releaseHandle () {
    if (handle !is null) OS.gtk_widget_destroy (handle);
    handle = imageHandle = null;
    super.releaseHandle ();
    parent = null;
}

override void releaseWidget () {
    super.releaseWidget ();
    if (tooltipsHandle !is null) OS.g_object_unref (tooltipsHandle);
    tooltipsHandle = null;
    if (imageList !is null) imageList.dispose ();
    imageList = null;
    toolTipText = null;
}

/**
 * Removes the listener from the collection of listeners who will
 * be notified when the platform-specific context menu trigger has
 * occurred.
 *
 * @param listener the listener which should no longer be notified
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
 * </ul>
 * @exception SWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 *
 * @see MenuDetectListener
 * @see #addMenuDetectListener
 *
 * @since 3.3
 */
public void removeMenuDetectListener (MenuDetectListener listener) {
    checkWidget ();
    if (listener is null) error (SWT.ERROR_NULL_ARGUMENT);
    if (eventTable is null) return;
    eventTable.unhook (SWT.MenuDetect, listener);
}

/**
 * Removes the listener from the collection of listeners who will
 * be notified when the receiver is selected by the user.
 *
 * @param listener the listener which should no longer be notified
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
 * </ul>
 * @exception SWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 *
 * @see SelectionListener
 * @see #addSelectionListener
 */
public void removeSelectionListener (SelectionListener listener) {
    checkWidget ();
    if (listener is null) error (SWT.ERROR_NULL_ARGUMENT);
    if (eventTable is null) return;
    eventTable.unhook (SWT.Selection, listener);
    eventTable.unhook (SWT.DefaultSelection, listener);
}

/**
 * Sets the receiver's image.
 *
 * @param image the new image
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_INVALID_ARGUMENT - if the image has been disposed</li>
 * </ul>
 * @exception SWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 */
public override void setImage (Image image) {
    checkWidget ();
    if (image !is null && image.isDisposed ()) error (SWT.ERROR_INVALID_ARGUMENT);
    this.image = image;
    if (image !is null) {
        Rectangle rect = image.getBounds ();
        OS.gtk_widget_set_size_request (handle, rect.width, rect.height);
        if (imageList is null) imageList = new ImageList ();
        int imageIndex = imageList.indexOf (image);
        if (imageIndex is -1) {
            imageIndex = imageList.add (image);
        } else {
            imageList.put (imageIndex, image);
        }
        auto pixbuf = imageList.getPixbuf (imageIndex);
        OS.gtk_image_set_from_pixbuf (cast(GtkImage*)imageHandle, pixbuf);
        OS.gtk_widget_show (imageHandle);
    } else {
        OS.gtk_widget_set_size_request (handle, 1, 1);
        OS.gtk_image_set_from_pixbuf (cast(GtkImage*)imageHandle, null);
        OS.gtk_widget_hide (imageHandle);
    }
}

/**
 * Sets the receiver's tool tip to the argument, which
 * may be null indicating that no tool tip should be shown.
 *
 * @param toolTip the new tool tip (or null)
 *
 * @exception SWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 *
 * @since 3.2
 */
public void setToolTip (ToolTip toolTip) {
    checkWidget ();
    ToolTip oldTip = this.toolTip, newTip = toolTip;
    if (oldTip !is null) oldTip.item = null;
    this.toolTip = newTip;
    if (newTip !is null) newTip.item = this;
}

/**
 * Sets the receiver's tool tip text to the argument, which
 * may be null indicating that no tool tip text should be shown.
 *
 * @param value the new tool tip text (or null)
 *
 * @exception SWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 */
public void setToolTipText (String string) {
    checkWidget ();
    toolTipText = string;
    char* buffer = null;
    if (string !is null && string.length > 0) {
        buffer = toStringz( string );
    }
    if (tooltipsHandle is null) {
        tooltipsHandle = cast(GtkWidget*)OS.gtk_tooltips_new ();
        if (tooltipsHandle is null) error (SWT.ERROR_NO_HANDLES);
        OS.g_object_ref (cast(GObject*)tooltipsHandle);
        OS.gtk_object_sink (cast(GtkObject*)tooltipsHandle);
    }
    OS.gtk_tooltips_set_tip (cast(GtkTooltips*)tooltipsHandle, handle, buffer, null);
}

/**
 * Makes the receiver visible if the argument is <code>true</code>,
 * and makes it invisible otherwise.
 *
 * @param visible the new visibility state
 *
 * @exception SWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 */
public void setVisible (bool visible) {
    checkWidget ();
    if (OS.GTK_WIDGET_VISIBLE (handle) is visible) return;
    if (visible) {
        /*
        * It is possible (but unlikely), that application
        * code could have disposed the widget in the show
        * event.  If this happens, just return.
        */
        sendEvent (SWT.Show);
        if (isDisposed ()) return;
        OS.gtk_widget_show (handle);
    } else {
        OS.gtk_widget_hide (handle);
        sendEvent (SWT.Hide);
    }
}
}