/*
* Copyright (C) 2008 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package android.view;
import android.app.Activity;
import android.content.Intent;
import android.graphics.drawable.Drawable;
import android.view.ContextMenu.ContextMenuInfo;
import android.view.View.OnCreateContextMenuListener;
/**
* Interface for direct access to a previously created menu item.
* <p>
* An Item is returned by calling one of the {@link android.view.Menu#add}
* methods.
* <p>
* For a feature set of specific menu types, see {@link Menu}.
*/
public interface MenuItem {
/**
* Interface definition for a callback to be invoked when a menu item is
* clicked.
*
* @see Activity#onContextItemSelected(MenuItem)
* @see Activity#onOptionsItemSelected(MenuItem)
*/
public interface OnMenuItemClickListener {
/**
* Called when a menu item has been invoked. This is the first code
* that is executed; if it returns true, no other callbacks will be
* executed.
*
* @param item The menu item that was invoked.
*
* @return Return true to consume this click and prevent others from
* executing.
*/
public boolean onMenuItemClick(MenuItem item);
}
/**
* Return the identifier for this menu item. The identifier can not
* be changed after the menu is created.
*
* @return The menu item's identifier.
*/
public int getItemId();
/**
* Return the group identifier that this menu item is part of. The group
* identifier can not be changed after the menu is created.
*
* @return The menu item's group identifier.
*/
public int getGroupId();
/**
* Return the category and order within the category of this item. This
* item will be shown before all items (within its category) that have
* order greater than this value.
* <p>
* An order integer contains the item's category (the upper bits of the
* integer; set by or/add the category with the order within the
* category) and the ordering of the item within that category (the
* lower bits). Example categories are {@link Menu#CATEGORY_SYSTEM},
* {@link Menu#CATEGORY_SECONDARY}, {@link Menu#CATEGORY_ALTERNATIVE},
* {@link Menu#CATEGORY_CONTAINER}. See {@link Menu} for a full list.
*
* @return The order of this item.
*/
public int getOrder();
/**
* Change the title associated with this item.
*
* @param title The new text to be displayed.
* @return This Item so additional setters can be called.
*/
public MenuItem setTitle(CharSequence title);
/**
* Change the title associated with this item.
* <p>
* Some menu types do not sufficient space to show the full title, and
* instead a condensed title is preferred. See {@link Menu} for more
* information.
*
* @param title The resource id of the new text to be displayed.
* @return This Item so additional setters can be called.
* @see #setTitleCondensed(CharSequence)
*/
public MenuItem setTitle(int title);
/**
* Retrieve the current title of the item.
*
* @return The title.
*/
public CharSequence getTitle();
/**
* Change the condensed title associated with this item. The condensed
* title is used in situations where the normal title may be too long to
* be displayed.
*
* @param title The new text to be displayed as the condensed title.
* @return This Item so additional setters can be called.
*/
public MenuItem setTitleCondensed(CharSequence title);
/**
* Retrieve the current condensed title of the item. If a condensed
* title was never set, it will return the normal title.
*
* @return The condensed title, if it exists.
* Otherwise the normal title.
*/
public CharSequence getTitleCondensed();
/**
* Change the icon associated with this item. This icon will not always be
* shown, so the title should be sufficient in describing this item. See
* {@link Menu} for the menu types that support icons.
*
* @param icon The new icon (as a Drawable) to be displayed.
* @return This Item so additional setters can be called.
*/
public MenuItem setIcon(Drawable icon);
/**
* Change the icon associated with this item. This icon will not always be
* shown, so the title should be sufficient in describing this item. See
* {@link Menu} for the menu types that support icons.
* <p>
* This method will set the resource ID of the icon which will be used to
* lazily get the Drawable when this item is being shown.
*
* @param iconRes The new icon (as a resource ID) to be displayed.
* @return This Item so additional setters can be called.
*/
public MenuItem setIcon(int iconRes);
/**
* Returns the icon for this item as a Drawable (getting it from resources if it hasn't been
* loaded before).
*
* @return The icon as a Drawable.
*/
public Drawable getIcon();
/**
* Change the Intent associated with this item. By default there is no
* Intent associated with a menu item. If you set one, and nothing
* else handles the item, then the default behavior will be to call
* {@link android.content.Context#startActivity} with the given Intent.
*
* <p>Note that setIntent() can not be used with the versions of
* {@link Menu#add} that take a Runnable, because {@link Runnable#run}
* does not return a value so there is no way to tell if it handled the
* item. In this case it is assumed that the Runnable always handles
* the item, and the intent will never be started.
*
* @see #getIntent
* @param intent The Intent to associated with the item. This Intent
* object is <em>not</em> copied, so be careful not to
* modify it later.
* @return This Item so additional setters can be called.
*/
public MenuItem setIntent(Intent intent);
/**
* Return the Intent associated with this item. This returns a
* reference to the Intent which you can change as desired to modify
* what the Item is holding.
*
* @see #setIntent
* @return Returns the last value supplied to {@link #setIntent}, or
* null.
*/
public Intent getIntent();
/**
* Change both the numeric and alphabetic shortcut associated with this
* item. Note that the shortcut will be triggered when the key that
* generates the given character is pressed alone or along with with the alt
* key. Also note that case is not significant and that alphabetic shortcut
* characters will be displayed in lower case.
* <p>
* See {@link Menu} for the menu types that support shortcuts.
*
* @param numericChar The numeric shortcut key. This is the shortcut when
* using a numeric (e.g., 12-key) keyboard.
* @param alphaChar The alphabetic shortcut key. This is the shortcut when
* using a keyboard with alphabetic keys.
* @return This Item so additional setters can be called.
*/
public MenuItem setShortcut(char numericChar, char alphaChar);
/**
* Change the numeric shortcut associated with this item.
* <p>
* See {@link Menu} for the menu types that support shortcuts.
*
* @param numericChar The numeric shortcut key. This is the shortcut when
* using a 12-key (numeric) keyboard.
* @return This Item so additional setters can be called.
*/
public MenuItem setNumericShortcut(char numericChar);
/**
* Return the char for this menu item's numeric (12-key) shortcut.
*
* @return Numeric character to use as a shortcut.
*/
public char getNumericShortcut();
/**
* Change the alphabetic shortcut associated with this item. The shortcut
* will be triggered when the key that generates the given character is
* pressed alone or along with with the alt key. Case is not significant and
* shortcut characters will be displayed in lower case. Note that menu items
* with the characters '\b' or '\n' as shortcuts will get triggered by the
* Delete key or Carriage Return key, respectively.
* <p>
* See {@link Menu} for the menu types that support shortcuts.
*
* @param alphaChar The alphabetic shortcut key. This is the shortcut when
* using a keyboard with alphabetic keys.
* @return This Item so additional setters can be called.
*/
public MenuItem setAlphabeticShortcut(char alphaChar);
/**
* Return the char for this menu item's alphabetic shortcut.
*
* @return Alphabetic character to use as a shortcut.
*/
public char getAlphabeticShortcut();
/**
* Control whether this item can display a check mark. Setting this does
* not actually display a check mark (see {@link #setChecked} for that);
* rather, it ensures there is room in the item in which to display a
* check mark.
* <p>
* See {@link Menu} for the menu types that support check marks.
*
* @param checkable Set to true to allow a check mark, false to
* disallow. The default is false.
* @see #setChecked
* @see #isCheckable
* @see Menu#setGroupCheckable
* @return This Item so additional setters can be called.
*/
public MenuItem setCheckable(boolean checkable);
/**
* Return whether the item can currently display a check mark.
*
* @return If a check mark can be displayed, returns true.
*
* @see #setCheckable
*/
public boolean isCheckable();
/**
* Control whether this item is shown with a check mark. Note that you
* must first have enabled checking with {@link #setCheckable} or else
* the check mark will not appear. If this item is a member of a group that contains
* mutually-exclusive items (set via {@link Menu#setGroupCheckable(int, boolean, boolean)},
* the other items in the group will be unchecked.
* <p>
* See {@link Menu} for the menu types that support check marks.
*
* @see #setCheckable
* @see #isChecked
* @see Menu#setGroupCheckable
* @param checked Set to true to display a check mark, false to hide
* it. The default value is false.
* @return This Item so additional setters can be called.
*/
public MenuItem setChecked(boolean checked);
/**
* Return whether the item is currently displaying a check mark.
*
* @return If a check mark is displayed, returns true.
*
* @see #setChecked
*/
public boolean isChecked();
/**
* Sets the visibility of the menu item. Even if a menu item is not visible,
* it may still be invoked via its shortcut (to completely disable an item,
* set it to invisible and {@link #setEnabled(boolean) disabled}).
*
* @param visible If true then the item will be visible; if false it is
* hidden.
* @return This Item so additional setters can be called.
*/
public MenuItem setVisible(boolean visible);
/**
* Return the visibility of the menu item.
*
* @return If true the item is visible; else it is hidden.
*/
public boolean isVisible();
/**
* Sets whether the menu item is enabled. Disabling a menu item will not
* allow it to be invoked via its shortcut. The menu item will still be
* visible.
*
* @param enabled If true then the item will be invokable; if false it is
* won't be invokable.
* @return This Item so additional setters can be called.
*/
public MenuItem setEnabled(boolean enabled);
/**
* Return the enabled state of the menu item.
*
* @return If true the item is enabled and hence invokable; else it is not.
*/
public boolean isEnabled();
/**
* Check whether this item has an associated sub-menu. I.e. it is a
* sub-menu of another menu.
*
* @return If true this item has a menu; else it is a
* normal item.
*/
public boolean hasSubMenu();
/**
* Get the sub-menu to be invoked when this item is selected, if it has
* one. See {@link #hasSubMenu()}.
*
* @return The associated menu if there is one, else null
*/
public SubMenu getSubMenu();
/**
* Set a custom listener for invocation of this menu item. In most
* situations, it is more efficient and easier to use
* {@link Activity#onOptionsItemSelected(MenuItem)} or
* {@link Activity#onContextItemSelected(MenuItem)}.
*
* @param menuItemClickListener The object to receive invokations.
* @return This Item so additional setters can be called.
* @see Activity#onOptionsItemSelected(MenuItem)
* @see Activity#onContextItemSelected(MenuItem)
*/
public MenuItem setOnMenuItemClickListener(MenuItem.OnMenuItemClickListener menuItemClickListener);
/**
* Gets the extra information linked to this menu item. This extra
* information is set by the View that added this menu item to the
* menu.
*
* @see OnCreateContextMenuListener
* @return The extra information linked to the View that added this
* menu item to the menu. This can be null.
*/
public ContextMenuInfo getMenuInfo();
}