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Java example source code file (awt_Choice.cpp)

This example Java source code file (awt_Choice.cpp) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

awtchoice, catch_bad_alloc, dassert, false, jni_version_1_2, jnicall, jnienv, jniexport, jnu_getenv, msgrouting, null, pdata, try, uint

The awt_Choice.cpp Java example source code

/*
 * Copyright (c) 1996, 2013, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

#include <windowsx.h>

#include "awt_Toolkit.h"
#include "awt_Choice.h"
#include "awt_Canvas.h"

#include "awt_Dimension.h"
#include "awt_Container.h"

#include "ComCtl32Util.h"

#include <java_awt_Toolkit.h>
#include <java_awt_FontMetrics.h>
#include <java_awt_event_InputEvent.h>

/* IMPORTANT! Read the README.JNI file for notes on JNI converted AWT code.
 */

/************************************************************************/
// Struct for _Reshape() method
struct ReshapeStruct {
    jobject choice;
    jint x, y;
    jint width, height;
};
// Struct for _Select() method
struct SelectStruct {
    jobject choice;
    jint index;
};
// Struct for _AddItems() method
struct AddItemsStruct {
    jobject choice;
    jobjectArray items;
    jint index;
};
// Struct for _Remove() method
struct RemoveStruct {
    jobject choice;
    jint index;
};

/************************************************************************/

/* Bug #4509045: set if SetDragCapture captured mouse */

BOOL AwtChoice::mouseCapture = FALSE;

/* Bug #4338368: consume the spurious MouseUp when the choice loses focus */

BOOL AwtChoice::skipNextMouseUp = FALSE;

BOOL AwtChoice::sm_isMouseMoveInList = FALSE;

static const UINT MINIMUM_NUMBER_OF_VISIBLE_ITEMS = 8;

namespace {
    jfieldID selectedIndexID;
}

/*************************************************************************
 * AwtChoice class methods
 */

AwtChoice::AwtChoice() {
    m_hList = NULL;
    m_listDefWindowProc = NULL;
}

LPCTSTR AwtChoice::GetClassName() {
    return TEXT("COMBOBOX");  /* System provided combobox class */
}

void AwtChoice::Dispose() {
    if (m_hList != NULL && m_listDefWindowProc != NULL) {
        ComCtl32Util::GetInstance().UnsubclassHWND(m_hList, ListWindowProc, m_listDefWindowProc);
    }
    AwtComponent::Dispose();
}

AwtChoice* AwtChoice::Create(jobject peer, jobject parent) {

    JNIEnv *env = (JNIEnv *)JNU_GetEnv(jvm, JNI_VERSION_1_2);

    jobject target = NULL;
    AwtChoice* c = NULL;
    RECT rc;

    try {
        if (env->EnsureLocalCapacity(1) < 0) {
            return NULL;
        }
        AwtCanvas* awtParent;

        JNI_CHECK_NULL_GOTO(parent, "null parent", done);

        awtParent = (AwtCanvas*)JNI_GET_PDATA(parent);
        JNI_CHECK_NULL_GOTO(awtParent, "null awtParent", done);

        target = env->GetObjectField(peer, AwtObject::targetID);
        JNI_CHECK_NULL_GOTO(target, "null target", done);

        c = new AwtChoice();

        {
            DWORD style = WS_CHILD | WS_CLIPSIBLINGS | WS_VSCROLL |
                          CBS_DROPDOWNLIST | CBS_OWNERDRAWFIXED;
            DWORD exStyle = 0;
            if (GetRTL()) {
                exStyle |= WS_EX_RIGHT | WS_EX_LEFTSCROLLBAR;
                if (GetRTLReadingOrder())
                    exStyle |= WS_EX_RTLREADING;
            }

            /*
             * In OWNER_DRAW, the size of the edit control part of the
             * choice must be determinded in its creation, when the parent
             * cannot get the choice's instance from its handle.  So
             * record the pair of the ID and the instance of the choice.
             */
            UINT myId = awtParent->CreateControlID();
            DASSERT(myId > 0);
            c->m_myControlID = myId;
            awtParent->PushChild(myId, c);

            jint x = env->GetIntField(target, AwtComponent::xID);
            jint y = env->GetIntField(target, AwtComponent::yID);
            jint width = env->GetIntField(target, AwtComponent::widthID);
            jint height = env->GetIntField(target, AwtComponent::heightID);

            jobject dimension = JNU_CallMethodByName(env, NULL, peer,
                                                     "preferredSize",
                                                     "()Ljava/awt/Dimension;").l;
            DASSERT(!safe_ExceptionOccurred(env));

            if (dimension != NULL && width == 0) {
                width = env->GetIntField(dimension, AwtDimension::widthID);
            }
            c->CreateHWnd(env, L"", style, exStyle,
                          x, y, width, height,
                          awtParent->GetHWnd(),
                          reinterpret_cast<HMENU>(static_cast(myId)),
                          ::GetSysColor(COLOR_WINDOWTEXT),
                          ::GetSysColor(COLOR_WINDOW),
                          peer);

            /* suppress inheriting parent's color. */
            c->m_backgroundColorSet = TRUE;
            c->UpdateBackground(env, target);

            /* Bug 4255631 Solaris: Size returned by Choice.getSize() does not match
             * actual size
             * Fix: Set the Choice to its actual size in the component.
             */
            ::GetClientRect(c->GetHWnd(), &rc);
            env->SetIntField(target, AwtComponent::widthID,  (jint) rc.right);
            env->SetIntField(target, AwtComponent::heightID, (jint) rc.bottom);

            if (IS_WINXP) {
                ::SendMessage(c->GetHWnd(), CB_SETMINVISIBLE, (WPARAM) MINIMUM_NUMBER_OF_VISIBLE_ITEMS, 0);
            }

            env->DeleteLocalRef(dimension);
        }
    } catch (...) {
        env->DeleteLocalRef(target);
        throw;
    }

done:
    env->DeleteLocalRef(target);

    return c;
}

// calculate height of drop-down list part of the combobox
// to show all the items up to a maximum of eight
int AwtChoice::GetDropDownHeight()
{
    int itemHeight =(int)::SendMessage(GetHWnd(), CB_GETITEMHEIGHT, (UINT)0,0);
    int numItemsToShow = (int)::SendMessage(GetHWnd(), CB_GETCOUNT, 0,0);
    numItemsToShow = min(MINIMUM_NUMBER_OF_VISIBLE_ITEMS, numItemsToShow);
    // drop-down height snaps to nearest line, so add a
    // fudge factor of 1/2 line to ensure last line shows
    return itemHeight*numItemsToShow + itemHeight/2;
}

// get the height of the field portion of the combobox
int AwtChoice::GetFieldHeight()
{
    int fieldHeight;
    int borderHeight;
    fieldHeight =(int)::SendMessage(GetHWnd(), CB_GETITEMHEIGHT, (UINT)-1, 0);
    // add top and bottom border lines; border size is different for
    // Win 4.x (3d edge) vs 3.x (1 pixel line)
    borderHeight = ::GetSystemMetrics(SM_CYEDGE);
    fieldHeight += borderHeight*2;
    return fieldHeight;
}

// gets the total height of the combobox, including drop down
int AwtChoice::GetTotalHeight()
{
    int dropHeight = GetDropDownHeight();
    int fieldHeight = GetFieldHeight();
    int totalHeight;

    // border on drop-down portion is always non-3d (so don't use SM_CYEDGE)
    int borderHeight = ::GetSystemMetrics(SM_CYBORDER);
    // total height = drop down height + field height + top+bottom drop down border lines
    totalHeight = dropHeight + fieldHeight +borderHeight*2;
    return totalHeight;
}

// Recalculate and set the drop-down height for the Choice.
void AwtChoice::ResetDropDownHeight()
{
    RECT    rcWindow;

    ::GetWindowRect(GetHWnd(), &rcWindow);
    // resize the drop down to accommodate added/removed items
    int     totalHeight = GetTotalHeight();
    ::SetWindowPos(GetHWnd(), NULL,
                    0, 0, rcWindow.right - rcWindow.left, totalHeight,
                    SWP_NOACTIVATE|SWP_NOMOVE|SWP_NOZORDER);
}

/* Fix for the bug 4327666: set the capture for middle
   and right mouse buttons, but leave left button alone */
void AwtChoice::SetDragCapture(UINT flags)
{
    if ((flags & MK_LBUTTON) != 0) {
        if ((::GetCapture() == GetHWnd()) && mouseCapture) {
            /* On MK_LBUTTON ComboBox captures mouse itself
               so we should release capture and clear flag to
               prevent releasing capture by ReleaseDragCapture
             */
            ::ReleaseCapture();
            mouseCapture = FALSE;
        }
        return;
    }

    // don't want to interfere with other controls
    if (::GetCapture() == NULL) {
        ::SetCapture(GetHWnd());
        mouseCapture = TRUE;
    }
}

/* Fix for Bug 4509045: should release capture only if it is set by SetDragCapture */
void AwtChoice::ReleaseDragCapture(UINT flags)
{
    if ((::GetCapture() == GetHWnd()) && ((flags & ALL_MK_BUTTONS) == 0) && mouseCapture) {
        ::ReleaseCapture();
        mouseCapture = FALSE;
    }
}

void AwtChoice::Reshape(int x, int y, int w, int h)
{
    // Choice component height is fixed (when rolled up)
    // so vertically center the choice in it's bounding box
    JNIEnv *env = (JNIEnv *)JNU_GetEnv(jvm, JNI_VERSION_1_2);
    jobject target = GetTarget(env);
    jobject parent = env->GetObjectField(target, AwtComponent::parentID);
    RECT rc;

    int fieldHeight = GetFieldHeight();
    if ((parent != NULL && env->GetObjectField(parent, AwtContainer::layoutMgrID) != NULL) &&
        fieldHeight > 0 && fieldHeight < h) {
        y += (h - fieldHeight) / 2;
    }

    /* Fix for 4783342
     * Choice should ignore reshape on height changes,
     * as height is dependent on Font size only.
     */
    AwtComponent* awtParent = GetParent();
    BOOL bReshape = true;
    if (awtParent != NULL) {
        ::GetWindowRect(GetHWnd(), &rc);
        int oldW = rc.right - rc.left;
        RECT parentRc;
        ::GetWindowRect(awtParent->GetHWnd(), &parentRc);
        int oldX = rc.left - parentRc.left;
        int oldY = rc.top - parentRc.top;
        bReshape = (x != oldX || y != oldY || w != oldW);
    }

    if (bReshape)
    {
        int totalHeight = GetTotalHeight();
        AwtComponent::Reshape(x, y, w, totalHeight);
    }

    /* Bug 4255631 Solaris: Size returned by Choice.getSize() does not match
     * actual size
     * Fix: Set the Choice to its actual size in the component.
     */
    ::GetClientRect(GetHWnd(), &rc);
    env->SetIntField(target, AwtComponent::widthID,  (jint)rc.right);
    env->SetIntField(target, AwtComponent::heightID, (jint)rc.bottom);

    env->DeleteLocalRef(target);
    env->DeleteLocalRef(parent);
}

jobject AwtChoice::PreferredItemSize(JNIEnv *env)
{
    jobject dimension = JNU_CallMethodByName(env, NULL, GetPeer(env),
                                             "preferredSize",
                                             "()Ljava/awt/Dimension;").l;
    DASSERT(!safe_ExceptionOccurred(env));
    if (dimension == NULL) {
        return NULL;
    }
    /* This size is window size of choice and it's too big for each
     * drop down item height.
     */
    env->SetIntField(dimension, AwtDimension::heightID,
                       GetFontHeight(env));
    return dimension;
}

void AwtChoice::SetFont(AwtFont* font)
{
    AwtComponent::SetFont(font);

    //Get the text metrics and change the height of each item.
    HDC hDC = ::GetDC(GetHWnd());
    DASSERT(hDC != NULL);
    TEXTMETRIC tm;

    HANDLE hFont = font->GetHFont();
    VERIFY(::SelectObject(hDC, hFont) != NULL);
    VERIFY(::GetTextMetrics(hDC, &tm));
    long h = tm.tmHeight + tm.tmExternalLeading;
    VERIFY(::ReleaseDC(GetHWnd(), hDC) != 0);

    int nCount = (int)::SendMessage(GetHWnd(), CB_GETCOUNT, 0, 0);
    for(int i = 0; i < nCount; ++i) {
        VERIFY(::SendMessage(GetHWnd(), CB_SETITEMHEIGHT, i, MAKELPARAM(h, 0)) != CB_ERR);
    }
    //Change the height of the Edit Box.
    VERIFY(::SendMessage(GetHWnd(), CB_SETITEMHEIGHT, (UINT)-1,
                         MAKELPARAM(h, 0)) != CB_ERR);

    JNIEnv *env = (JNIEnv *)JNU_GetEnv(jvm, JNI_VERSION_1_2);
    jobject target = GetTarget(env);
    jint height = env->GetIntField(target, AwtComponent::heightID);

    Reshape(env->GetIntField(target, AwtComponent::xID),
            env->GetIntField(target, AwtComponent::yID),
            env->GetIntField(target, AwtComponent::widthID),
            h);

    env->DeleteLocalRef(target);
}

static int lastClickX = -1;
static int lastClickY = -1;

LRESULT CALLBACK AwtChoice::ListWindowProc(HWND hwnd, UINT message,
                                           WPARAM wParam, LPARAM lParam)
{
    /*
     * We don't pass the choice WM_LBUTTONDOWN message. As the result the choice's list
     * doesn't forward mouse messages it captures. Below we do forward what we need.
     */

    TRY;

    DASSERT(::IsWindow(hwnd));

    switch (message) {
        case WM_LBUTTONDOWN: {
            DWORD curPos = ::GetMessagePos();
            lastClickX = GET_X_LPARAM(curPos);
            lastClickY = GET_Y_LPARAM(curPos);
            break;
        }
        case WM_MOUSEMOVE: {
            RECT rect;
            ::GetClientRect(hwnd, &rect);

            POINT pt = {GET_X_LPARAM(lParam), GET_Y_LPARAM(lParam)};
            if (::PtInRect(&rect, pt)) {
                sm_isMouseMoveInList = TRUE;
            }

            POINT lastPt = {lastClickX, lastClickY};
            ::ScreenToClient(hwnd, &lastPt);
            if (::PtInRect(&rect, lastPt)) {
                break; // ignore when dragging inside the list
            }
        }
        case WM_LBUTTONUP: {
            lastClickX = -1;
            lastClickY = -1;

            AwtChoice *c = (AwtChoice *)::GetWindowLongPtr(hwnd, GWLP_USERDATA);
            if (c != NULL) {
                // forward the msg to the choice
                c->WindowProc(message, wParam, lParam);
            }
        }
    }
    return ComCtl32Util::GetInstance().DefWindowProc(NULL, hwnd, message, wParam, lParam);

    CATCH_BAD_ALLOC_RET(0);
}


MsgRouting AwtChoice::WmNotify(UINT notifyCode)
{
    if (notifyCode == CBN_SELCHANGE) {
        int selectedIndex = (int)SendMessage(CB_GETCURSEL);

        JNIEnv *env = (JNIEnv *)JNU_GetEnv(jvm, JNI_VERSION_1_2);
        jobject target = GetTarget(env);
        int previousIndex = env->GetIntField(target, selectedIndexID);

        if (selectedIndex != CB_ERR && selectedIndex != previousIndex){
            DoCallback("handleAction", "(I)V", selectedIndex);
        }
    } else if (notifyCode == CBN_DROPDOWN) {

        if (m_hList == NULL) {
            COMBOBOXINFO cbi;
            cbi.cbSize = sizeof(COMBOBOXINFO);
            ::GetComboBoxInfo(GetHWnd(), &cbi);
            m_hList = cbi.hwndList;
            m_listDefWindowProc = ComCtl32Util::GetInstance().SubclassHWND(m_hList, ListWindowProc);
            DASSERT(::GetWindowLongPtr(m_hList, GWLP_USERDATA) == NULL);
            ::SetWindowLongPtr(m_hList, GWLP_USERDATA, (LONG_PTR)this);
        }
        sm_isMouseMoveInList = FALSE;

        // Clicking in the dropdown list steals focus from the proxy.
        // So, set the focus-restore flag up.
        SetRestoreFocus(TRUE);
    } else if (notifyCode == CBN_CLOSEUP) {
        SetRestoreFocus(FALSE);
    }
    return mrDoDefault;
}

MsgRouting
AwtChoice::OwnerDrawItem(UINT /*ctrlId*/, DRAWITEMSTRUCT& drawInfo)
{
    DrawListItem((JNIEnv *)JNU_GetEnv(jvm, JNI_VERSION_1_2), drawInfo);
    return mrConsume;
}

MsgRouting
AwtChoice::OwnerMeasureItem(UINT /*ctrlId*/, MEASUREITEMSTRUCT& measureInfo)
{
    MeasureListItem((JNIEnv *)JNU_GetEnv(jvm, JNI_VERSION_1_2), measureInfo);
    return mrConsume;
}

/* Bug #4338368: when a choice loses focus, it triggers spurious MouseUp event,
 * even if the focus was lost due to TAB key pressing
 */

MsgRouting
AwtChoice::WmKillFocus(HWND hWndGotFocus)
{
    skipNextMouseUp = TRUE;
    return AwtComponent::WmKillFocus(hWndGotFocus);
}

MsgRouting
AwtChoice::WmMouseUp(UINT flags, int x, int y, int button)
{
    if (skipNextMouseUp) {
        skipNextMouseUp = FALSE;
        return mrDoDefault;
    }
    return AwtComponent::WmMouseUp(flags, x, y, button);
}

MsgRouting AwtChoice::HandleEvent(MSG *msg, BOOL synthetic)
{
    if (IsFocusingMouseMessage(msg)) {
        SendMessage(CB_SHOWDROPDOWN, ~SendMessage(CB_GETDROPPEDSTATE, 0, 0), 0);
        delete msg;
        return mrConsume;
    }
    // To simulate the native behavior, we close the list on WM_LBUTTONUP if
    // WM_MOUSEMOVE has been dedected on the list since it has been dropped down.
    if (msg->message == WM_LBUTTONUP && SendMessage(CB_GETDROPPEDSTATE, 0, 0) &&
        sm_isMouseMoveInList)
    {
        SendMessage(CB_SHOWDROPDOWN, FALSE, 0);
    }
    return AwtComponent::HandleEvent(msg, synthetic);
}

BOOL AwtChoice::InheritsNativeMouseWheelBehavior() {return true;}

void AwtChoice::_Reshape(void *param)
{
    JNIEnv *env = (JNIEnv *)JNU_GetEnv(jvm, JNI_VERSION_1_2);

    ReshapeStruct *rs = (ReshapeStruct *)param;
    jobject choice = rs->choice;
    jint x = rs->x;
    jint y = rs->y;
    jint width = rs->width;
    jint height = rs->height;

    AwtChoice *c = NULL;

    PDATA pData;
    JNI_CHECK_PEER_GOTO(choice, done);

    c = (AwtChoice *)pData;
    if (::IsWindow(c->GetHWnd()))
    {
        c->Reshape(x, y, width, height);
        c->VerifyState();
    }

done:
    env->DeleteGlobalRef(choice);

    delete rs;
}

void AwtChoice::_Select(void *param)
{
    JNIEnv *env = (JNIEnv *)JNU_GetEnv(jvm, JNI_VERSION_1_2);

    SelectStruct *ss = (SelectStruct *)param;
    jobject choice = ss->choice;
    jint index = ss->index;

    AwtChoice *c = NULL;

    PDATA pData;
    JNI_CHECK_PEER_GOTO(choice, done);

    c = (AwtChoice *)pData;
    if (::IsWindow(c->GetHWnd()))
    {
        c->SendMessage(CB_SETCURSEL, index);
//        c->VerifyState();
    }

done:
    env->DeleteGlobalRef(choice);

    delete ss;
}

void AwtChoice::_AddItems(void *param)
{
    JNIEnv *env = (JNIEnv *)JNU_GetEnv(jvm, JNI_VERSION_1_2);

    AddItemsStruct *ais = (AddItemsStruct *)param;
    jobject choice = ais->choice;
    jobjectArray items = ais->items;
    jint index = ais->index;

    AwtChoice *c = NULL;

    PDATA pData;
    JNI_CHECK_PEER_GOTO(choice, done);
    JNI_CHECK_NULL_GOTO(items, "null items", done);

    c = (AwtChoice *)pData;
    if (::IsWindow(c->GetHWnd()))
    {
        jsize i;
        int itemCount = env->GetArrayLength(items);
        if (itemCount > 0) {
           c->SendMessage(WM_SETREDRAW, (WPARAM)FALSE, 0);
           for (i = 0; i < itemCount; i++)
           {
               jstring item = (jstring)env->GetObjectArrayElement(items, i);
               JNI_CHECK_NULL_GOTO(item, "null item", next_elem);
               c->SendMessage(CB_INSERTSTRING, index + i, JavaStringBuffer(env, item));
               env->DeleteLocalRef(item);
next_elem:
               ;
           }
           c->SendMessage(WM_SETREDRAW, (WPARAM)TRUE, 0);
           InvalidateRect(c->GetHWnd(), NULL, TRUE);
           c->ResetDropDownHeight();
           c->VerifyState();
        }
    }

done:
    env->DeleteGlobalRef(choice);
    env->DeleteGlobalRef(items);

    delete ais;
}

void AwtChoice::_Remove(void *param)
{
    JNIEnv *env = (JNIEnv *)JNU_GetEnv(jvm, JNI_VERSION_1_2);

    RemoveStruct *rs = (RemoveStruct *)param;
    jobject choice = rs->choice;
    jint index = rs->index;

    AwtChoice *c = NULL;

    PDATA pData;
    JNI_CHECK_PEER_GOTO(choice, done);

    c = (AwtChoice *)pData;
    if (::IsWindow(c->GetHWnd()))
    {
        c->SendMessage(CB_DELETESTRING, index, 0);
        c->ResetDropDownHeight();
        c->VerifyState();
    }

done:
    env->DeleteGlobalRef(choice);

    delete rs;
}

void AwtChoice::_RemoveAll(void *param)
{
    JNIEnv *env = (JNIEnv *)JNU_GetEnv(jvm, JNI_VERSION_1_2);

    jobject choice = (jobject)param;

    AwtChoice *c = NULL;

    PDATA pData;
    JNI_CHECK_PEER_GOTO(choice, done);

    c = (AwtChoice *)pData;
    if (::IsWindow(c->GetHWnd()))
    {
        c->SendMessage(CB_RESETCONTENT, 0, 0);
        c->ResetDropDownHeight();
        c->VerifyState();
    }

done:
    env->DeleteGlobalRef(choice);
}

void AwtChoice::_CloseList(void *param)
{
    JNIEnv *env = (JNIEnv *)JNU_GetEnv(jvm, JNI_VERSION_1_2);

    jobject choice = (jobject)param;

    AwtChoice *c = NULL;

    PDATA pData;
    JNI_CHECK_PEER_GOTO(choice, done);

    c = (AwtChoice *)pData;
    if (::IsWindow(c->GetHWnd()) && c->SendMessage(CB_GETDROPPEDSTATE, 0, 0)) {
        c->SendMessage(CB_SHOWDROPDOWN, FALSE, 0);
    }

done:
    env->DeleteGlobalRef(choice);
}

/************************************************************************
 * WChoicePeer native methods
 */

extern "C" {

JNIEXPORT void JNICALL
Java_java_awt_Choice_initIDs(JNIEnv *env, jclass cls)
{
    TRY;
    selectedIndexID = env->GetFieldID(cls, "selectedIndex", "I");
    DASSERT(selectedIndexID);
    CATCH_BAD_ALLOC;
}

/*
 * Class:     sun_awt_windows_WChoicePeer
 * Method:    select
 * Signature: (I)V
 */
JNIEXPORT void JNICALL
Java_sun_awt_windows_WChoicePeer_select(JNIEnv *env, jobject self,
                                        jint index)
{
    TRY;

    SelectStruct *ss = new SelectStruct;
    ss->choice = env->NewGlobalRef(self);
    ss->index = index;

    AwtToolkit::GetInstance().SyncCall(AwtChoice::_Select, ss);
    // global refs and ss are removed in _Select

    CATCH_BAD_ALLOC;
}

/*
 * Class:     sun_awt_windows_WChoicePeer
 * Method:    remove
 * Signature: (I)V
 */
JNIEXPORT void JNICALL
Java_sun_awt_windows_WChoicePeer_remove(JNIEnv *env, jobject self,
                                        jint index)
{
    TRY;

    RemoveStruct *rs = new RemoveStruct;
    rs->choice = env->NewGlobalRef(self);
    rs->index = index;

    AwtToolkit::GetInstance().SyncCall(AwtChoice::_Remove, rs);
    // global ref and rs are deleted in _Remove

    CATCH_BAD_ALLOC;
}

/*
 * Class:     sun_awt_windows_WChoicePeer
 * Method:    removeAll
 * Signature: ()V
 */
JNIEXPORT void JNICALL
Java_sun_awt_windows_WChoicePeer_removeAll(JNIEnv *env, jobject self)
{
    TRY;

    jobject selfGlobalRef = env->NewGlobalRef(self);

    AwtToolkit::GetInstance().SyncCall(AwtChoice::_RemoveAll, (void *)selfGlobalRef);
    // selfGlobalRef is deleted in _RemoveAll

    CATCH_BAD_ALLOC;
}

/*
 * Class:     sun_awt_windows_WChoicePeer
 * Method:    addItems
 * Signature: ([Ljava/lang/String;I)V
 */
JNIEXPORT void JNICALL
Java_sun_awt_windows_WChoicePeer_addItems(JNIEnv *env, jobject self,
                                          jobjectArray items, jint index)
{
    TRY;

    AddItemsStruct *ais = new AddItemsStruct;
    ais->choice = env->NewGlobalRef(self);
    ais->items = (jobjectArray)env->NewGlobalRef(items);
    ais->index = index;

    AwtToolkit::GetInstance().SyncCall(AwtChoice::_AddItems, ais);
    // global refs and ais are deleted in _AddItems

    CATCH_BAD_ALLOC;
}

/*
 * Class:     sun_awt_windows_WChoicePeer
 * Method:    reshape
 * Signature: (IIII)V
 */
JNIEXPORT void JNICALL
Java_sun_awt_windows_WChoicePeer_reshape(JNIEnv *env, jobject self,
                                         jint x, jint y,
                                         jint width, jint height)
{
    TRY;

    ReshapeStruct *rs = new ReshapeStruct;
    rs->choice = env->NewGlobalRef(self);
    rs->x = x;
    rs->y = y;
    rs->width = width;
    rs->height = height;

    AwtToolkit::GetInstance().SyncCall(AwtChoice::_Reshape, rs);
    // global ref and rs are deleted in _Reshape

    CATCH_BAD_ALLOC;
}

/*
 * Class:     sun_awt_windows_WChoicePeer
 * Method:    create
 * Signature: (Lsun/awt/windows/WComponentPeer;)V
 */
JNIEXPORT void JNICALL
Java_sun_awt_windows_WChoicePeer_create(JNIEnv *env, jobject self,
                                        jobject parent)
{
    TRY;

    PDATA pData;
    JNI_CHECK_PEER_RETURN(parent);
    AwtToolkit::CreateComponent(self, parent,
                                (AwtToolkit::ComponentFactory)
                                AwtChoice::Create);
    JNI_CHECK_PEER_CREATION_RETURN(self);

    CATCH_BAD_ALLOC;
}

/*
 * Class:     sun_awt_windows_WChoicePeer
 * Method:    closeList
 * Signature: ()V
 */
JNIEXPORT void JNICALL
Java_sun_awt_windows_WChoicePeer_closeList(JNIEnv *env, jobject self)
{
    TRY;

    jobject selfGlobalRef = env->NewGlobalRef(self);

    AwtToolkit::GetInstance().SyncCall(AwtChoice::_CloseList, (void *)selfGlobalRef);
    // global ref is deleted in _CloseList

    CATCH_BAD_ALLOC;
}
} /* extern "C" */


/************************************************************************
 * Diagnostic routines
 */

#ifdef DEBUG

void AwtChoice::VerifyState()
{
    if (AwtToolkit::GetInstance().VerifyComponents() == FALSE) {
        return;
    }

    if (m_callbacksEnabled == FALSE) {
        /* Component is not fully setup yet. */
        return;
    }

    AwtComponent::VerifyState();
    JNIEnv *env = (JNIEnv *)JNU_GetEnv(jvm, JNI_VERSION_1_2);
    if (env->PushLocalFrame(1) < 0)
        return;

    jobject target = GetTarget(env);

    // To avoid possibly running client code on the toolkit thread, don't
    // do the following checks if we're running on the toolkit thread.
    if (AwtToolkit::MainThread() != ::GetCurrentThreadId()) {
        // Compare number of items.
        int nTargetItems = JNU_CallMethodByName(env, NULL, target,
                                                "countItems", "()I").i;
        DASSERT(!safe_ExceptionOccurred(env));
        int nPeerItems = (int)::SendMessage(GetHWnd(), CB_GETCOUNT, 0, 0);
        DASSERT(nTargetItems == nPeerItems);

        // Compare selection
        int targetIndex = JNU_CallMethodByName(env, NULL, target,
                                               "getSelectedIndex", "()I").i;
        DASSERT(!safe_ExceptionOccurred(env));
        int peerCurSel = (int)::SendMessage(GetHWnd(), CB_GETCURSEL, 0, 0);
        DASSERT(targetIndex == peerCurSel);
    }
    env->PopLocalFrame(0);
}
#endif //DEBUG

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