webview.cpp

linux下开源浏览器WebKit的源码,市面上的很多商用浏览器都是移植自WebKit

    }

    lParam = MAKELPARAM(coords.x, coords.y);

    // The contextMenuController() holds onto the last context menu that was popped up on the
    // page until a new one is created. We need to clear this menu before propagating the event
    // through the DOM so that we can detect if we create a new menu for this event, since we
    // won't create a new menu if the DOM swallows the event and the defaultEventHandler does
    // not run.
    m_page->contextMenuController()->clearContextMenu();

    IntPoint documentPoint(m_page->mainFrame()->view()->windowToContents(coords));
    HitTestResult result = m_page->mainFrame()->eventHandler()->hitTestResultAtPoint(documentPoint, false);
    Frame* targetFrame = result.innerNonSharedNode() ? result.innerNonSharedNode()->document()->frame() : m_page->focusController()->focusedOrMainFrame();

    targetFrame->view()->setCursor(pointerCursor());
    PlatformMouseEvent mouseEvent(m_viewWindow, WM_RBUTTONUP, wParam, lParam);
    bool handledEvent = targetFrame->eventHandler()->sendContextMenuEvent(mouseEvent);
    if (!handledEvent)
        return false;

    // Show the menu
    ContextMenu* coreMenu = m_page->contextMenuController()->contextMenu();
    if (!coreMenu)
        return false;

    Node* node = coreMenu->hitTestResult().innerNonSharedNode();
    if (!node)
        return false;

    Frame* frame = node->document()->frame();
    if (!frame)
        return false;

    FrameView* view = frame->view();
    if (!view)
        return false;

    POINT point(view->contentsToWindow(coreMenu->hitTestResult().point()));

    // Translate the point to screen coordinates
    if (!::ClientToScreen(m_viewWindow, &point))
        return false;

    BOOL hasCustomMenus = false;
    if (m_uiDelegate)
        m_uiDelegate->hasCustomMenuImplementation(&hasCustomMenus);

    if (hasCustomMenus)
        m_uiDelegate->trackCustomPopupMenu((IWebView*)this, (OLE_HANDLE)(ULONG64)coreMenu->platformDescription(), &point);
    else {
        // Surprisingly, TPM_RIGHTBUTTON means that items are selectable with either the right OR left mouse button
        UINT flags = TPM_RIGHTBUTTON | TPM_TOPALIGN | TPM_VERPOSANIMATION | TPM_HORIZONTAL
            | TPM_LEFTALIGN | TPM_HORPOSANIMATION;
        ::TrackPopupMenuEx(coreMenu->platformDescription(), flags, point.x, point.y, m_viewWindow, 0);
    }

    return true;
}

bool WebView::onMeasureItem(WPARAM /*wParam*/, LPARAM lParam)
{
    if (!m_uiDelegate)
        return false;

    BOOL hasCustomMenus = false;
    m_uiDelegate->hasCustomMenuImplementation(&hasCustomMenus);
    if (!hasCustomMenus)
        return false;

    m_uiDelegate->measureCustomMenuItem((IWebView*)this, (void*)lParam);
    return true;
}

bool WebView::onDrawItem(WPARAM /*wParam*/, LPARAM lParam)
{
    if (!m_uiDelegate)
        return false;

    BOOL hasCustomMenus = false;
    m_uiDelegate->hasCustomMenuImplementation(&hasCustomMenus);
    if (!hasCustomMenus)
        return false;

    m_uiDelegate->drawCustomMenuItem((IWebView*)this, (void*)lParam);
    return true;
}

bool WebView::onInitMenuPopup(WPARAM wParam, LPARAM /*lParam*/)
{
    if (!m_uiDelegate)
        return false;

    HMENU menu = (HMENU)wParam;
    if (!menu)
        return false;

    BOOL hasCustomMenus = false;
    m_uiDelegate->hasCustomMenuImplementation(&hasCustomMenus);
    if (!hasCustomMenus)
        return false;

    m_uiDelegate->addCustomMenuDrawingData((IWebView*)this, (OLE_HANDLE)(ULONG64)menu);
    return true;
}

bool WebView::onUninitMenuPopup(WPARAM wParam, LPARAM /*lParam*/)
{
    if (!m_uiDelegate)
        return false;

    HMENU menu = (HMENU)wParam;
    if (!menu)
        return false;

    BOOL hasCustomMenus = false;
    m_uiDelegate->hasCustomMenuImplementation(&hasCustomMenus);
    if (!hasCustomMenus)
        return false;

    m_uiDelegate->cleanUpCustomMenuDrawingData((IWebView*)this, (OLE_HANDLE)(ULONG64)menu);
    return true;
}

void WebView::performContextMenuAction(WPARAM wParam, LPARAM lParam, bool byPosition)
{
    ContextMenu* menu = m_page->contextMenuController()->contextMenu();
    ASSERT(menu);

    ContextMenuItem* item = byPosition ? menu->itemAtIndex((unsigned)wParam, (HMENU)lParam) : menu->itemWithAction((ContextMenuAction)wParam);
    if (!item)
        return;
    m_page->contextMenuController()->contextMenuItemSelected(item);
    delete item;
}

bool WebView::handleMouseEvent(UINT message, WPARAM wParam, LPARAM lParam)
{
    static LONG globalClickCount;
    static IntPoint globalPrevPoint;
    static MouseButton globalPrevButton;
    static LONG globalPrevMouseDownTime;

    // Create our event.
    // On WM_MOUSELEAVE we need to create a mouseout event, so we force the position
    // of the event to be at (MINSHORT, MINSHORT).
    LPARAM position = (message == WM_MOUSELEAVE) ? ((MINSHORT << 16) | MINSHORT) : lParam;
    PlatformMouseEvent mouseEvent(m_viewWindow, message, wParam, position, m_mouseActivated);
   
    bool insideThreshold = abs(globalPrevPoint.x() - mouseEvent.pos().x()) < ::GetSystemMetrics(SM_CXDOUBLECLK) &&
                           abs(globalPrevPoint.y() - mouseEvent.pos().y()) < ::GetSystemMetrics(SM_CYDOUBLECLK);
    LONG messageTime = ::GetMessageTime();

    if (inResizer(position)) {
        if (m_uiDelegate) {
            COMPtr<IWebUIDelegatePrivate4> uiPrivate(Query, m_uiDelegate);

            if (uiPrivate)
                uiPrivate->webViewSendResizeMessage(message, wParam, position);
        }
        return true;
    }

    bool handled = false;

    if (message == WM_LBUTTONDOWN || message == WM_MBUTTONDOWN || message == WM_RBUTTONDOWN) {
        // FIXME: I'm not sure if this is the "right" way to do this
        // but without this call, we never become focused since we don't allow
        // the default handling of mouse events.
        SetFocus(m_viewWindow);

        // Always start capturing events when the mouse goes down in our HWND.
        ::SetCapture(m_viewWindow);

        if (((messageTime - globalPrevMouseDownTime) < (LONG)::GetDoubleClickTime()) && 
            insideThreshold &&
            mouseEvent.button() == globalPrevButton)
            globalClickCount++;
        else
            // Reset the click count.
            globalClickCount = 1;
        globalPrevMouseDownTime = messageTime;
        globalPrevButton = mouseEvent.button();
        globalPrevPoint = mouseEvent.pos();
        
        mouseEvent.setClickCount(globalClickCount);
        handled = m_page->mainFrame()->eventHandler()->handleMousePressEvent(mouseEvent);
    } else if (message == WM_LBUTTONDBLCLK || message == WM_MBUTTONDBLCLK || message == WM_RBUTTONDBLCLK) {
        globalClickCount++;
        mouseEvent.setClickCount(globalClickCount);
        handled = m_page->mainFrame()->eventHandler()->handleMousePressEvent(mouseEvent);
    } else if (message == WM_LBUTTONUP || message == WM_MBUTTONUP || message == WM_RBUTTONUP) {
        // Record the global position and the button of the up.
        globalPrevButton = mouseEvent.button();
        globalPrevPoint = mouseEvent.pos();
        mouseEvent.setClickCount(globalClickCount);
        m_page->mainFrame()->eventHandler()->handleMouseReleaseEvent(mouseEvent);
        ::ReleaseCapture();
    } else if (message == WM_MOUSELEAVE && m_mouseOutTracker) {
        // Once WM_MOUSELEAVE is fired windows clears this tracker
        // so there is no need to disable it ourselves.
        m_mouseOutTracker.set(0);
        m_page->mainFrame()->eventHandler()->mouseMoved(mouseEvent);
        handled = true;
    } else if (message == WM_MOUSEMOVE) {
        if (!insideThreshold)
            globalClickCount = 0;
        mouseEvent.setClickCount(globalClickCount);
        handled = m_page->mainFrame()->eventHandler()->mouseMoved(mouseEvent);
        if (!m_mouseOutTracker) {
            m_mouseOutTracker.set(new TRACKMOUSEEVENT);
            m_mouseOutTracker->cbSize = sizeof(TRACKMOUSEEVENT);
            m_mouseOutTracker->dwFlags = TME_LEAVE;
            m_mouseOutTracker->hwndTrack = m_viewWindow;
            ::TrackMouseEvent(m_mouseOutTracker.get());
        }
    }
    setMouseActivated(false);
    return handled;
}

bool WebView::mouseWheel(WPARAM wParam, LPARAM lParam, bool isHorizontal)
{
    // Ctrl+Mouse wheel doesn't ever go into WebCore.  It is used to
    // zoom instead (Mac zooms the whole Desktop, but Windows browsers trigger their
    // own local zoom modes for Ctrl+wheel).
    if (wParam & MK_CONTROL) {
        short delta = short(HIWORD(wParam));
        if (delta < 0)
            makeTextLarger(0);
        else
            makeTextSmaller(0);
        return true;
    }

    PlatformWheelEvent wheelEvent(m_viewWindow, wParam, lParam, isHorizontal);
    Frame* coreFrame = core(m_mainFrame);
    if (!coreFrame)
        return false;

    return coreFrame->eventHandler()->handleWheelEvent(wheelEvent);
}

bool WebView::execCommand(WPARAM wParam, LPARAM /*lParam*/)
{
    Frame* frame = m_page->focusController()->focusedOrMainFrame();
    switch (LOWORD(wParam)) {
        case SelectAll:
            return frame->editor()->command("SelectAll").execute();
        case Undo:
            return frame->editor()->command("Undo").execute();
        case Redo:
            return frame->editor()->command("Redo").execute();
    }
    return false;
}

bool WebView::keyUp(WPARAM virtualKeyCode, LPARAM keyData, bool systemKeyDown)
{
    PlatformKeyboardEvent keyEvent(m_viewWindow, virtualKeyCode, keyData, PlatformKeyboardEvent::KeyUp, systemKeyDown);

    Frame* frame = m_page->focusController()->focusedOrMainFrame();
    m_currentCharacterCode = 0;

    return frame->eventHandler()->keyEvent(keyEvent);
}

static const unsigned CtrlKey = 1 << 0;
static const unsigned AltKey = 1 << 1;
static const unsigned ShiftKey = 1 << 2;


struct KeyDownEntry {
    unsigned virtualKey;
    unsigned modifiers;
    const char* name;
};

struct KeyPressEntry {
    unsigned charCode;
    unsigned modifiers;
    const char* name;
};

static const KeyDownEntry keyDownEntries[] = {
    { VK_LEFT,   0,                  "MoveLeft"                                    },
    { VK_LEFT,   ShiftKey,           "MoveLeftAndModifySelection"                  },
    { VK_LEFT,   CtrlKey,            "MoveWordLeft"                                },
    { VK_LEFT,   CtrlKey | ShiftKey, "MoveWordLeftAndModifySelection"              },
    { VK_RIGHT,  0,                  "MoveRight"                                   },
    { VK_RIGHT,  ShiftKey,           "MoveRightAndModifySelection"                 },
    { VK_RIGHT,  CtrlKey,            "MoveWordRight"                               },
    { VK_RIGHT,  CtrlKey | ShiftKey, "MoveWordRightAndModifySelection"             },
    { VK_UP,     0,                  "MoveUp"                                      },
    { VK_UP,     ShiftKey,           "MoveUpAndModifySelection"                    },
    { VK_PRIOR,  ShiftKey,           "MovePageUpAndModifySelection"                },
    { VK_DOWN,   0,                  "MoveDown"                                    },
    { VK_DOWN,   ShiftKey,           "MoveDownAndModifySelection"                  },
    { VK_NEXT,   ShiftKey,           "MovePageDownAndModifySelection"              },
    { VK_PRIOR,  0,                  "MovePageUp"                                  },
    { VK_NEXT,   0,                  "MovePageDown"                                },
    { VK_HOME,   0,                  "MoveToBeginningOfLine"                       },
    { VK_HOME,   ShiftKey,           "MoveToBeginningOfLineAndModifySelection"     },
    { VK_HOME,   CtrlKey,            "MoveToBeginningOfDocument"                   },
    { VK_HOME,   CtrlKey | ShiftKey, "MoveToBeginningOfDocumentAndModifySelection" },

    { VK_END,    0,                  "MoveToEndOfLine"                             },
    { VK_END,    ShiftKey,           "MoveToEndOfLineAndModifySelection"           },
    { VK_END,    CtrlKey,            "MoveToEndOfDocument"                         },
    { VK_END,    CtrlKey | ShiftKey, "MoveToEndOfDocumentAndModifySelection"       },

    { VK_BACK,   0,                  "DeleteBackward"                              },
    { VK_BACK,   ShiftKey,           "DeleteBackward"                              },
    { VK_DELETE, 0,                  "DeleteForward"                               },
    { VK_BACK,   CtrlKey,            "DeleteWordBackward"                          },
    { VK_DELETE, CtrlKey,            "DeleteWordForward"                           },
    
    { 'B',       CtrlKey,            "ToggleBold"                                  },
    { 'I',       CtrlKey,            "ToggleItalic"                                },

    { VK_ESCAPE, 0,                  "Cancel"                                      },
    { VK_OEM_PERIOD, CtrlKey,        "Cancel"                                      },
    { VK_TAB,    0,                  "InsertTab"                                   },
    { VK_TAB,    ShiftKey,           "InsertBacktab"                               },
    { VK_RETURN, 0,                  "InsertNewline"                               },
    { VK_RETURN, CtrlKey,            "InsertNewline"                               },
    { VK_RETURN, AltKey,             "InsertNewline"                               },
    { VK_RETURN, AltKey | ShiftKey,  "InsertNewline"                               },

    // It's not quite clear whether clipboard shortcuts and Undo/Redo should be handled
    // in the application or in WebKit. We chose WebKit.
    { 'C',       CtrlKey,            "Copy"                                        },
    { 'V',       CtrlKey,            "Paste"                                       },
    { 'X',       CtrlKey,            "Cut"                                         },
    { 'A',       CtrlKey,            "SelectAll"                                   },
    { VK_INSERT, CtrlKey,            "Copy"                                        },
    { VK_DELETE, ShiftKey,           "Cut"                                         },
    { VK_INSERT, ShiftKey,           "Paste"                                       },
    { 'Z',       CtrlKey,            "Undo"                                        },
    { 'Z',       CtrlKey | ShiftKey, "Redo"                                        },
};

static const KeyPressEntry keyPressEntries[] = {
    { '\t',   0,                  "InsertTab"                                   },
    { '\t',   ShiftKey,           "InsertBacktab"                               },
    { '\r',   0,                  "InsertNewline"                               },
    { '\r',   CtrlKey,            "InsertNewline"                               },
    { '\r',   AltKey,             "InsertNewline"                               },
    { '\r',   AltKey | ShiftKey,  "InsertNewline"                               },
};

const char* WebView::interpretKeyEvent(const KeyboardEvent* evt)
{
    ASSERT(evt->type() == eventNames().keydownEvent || evt->type() == eventNames().keypressEvent);

    static HashMap<int, const char*>* keyDownCommandsMap = 0;
    static HashMap<int, const char*>* keyPressCommandsMap = 0;

    if (!keyDownCommandsMap) {
        keyDownCommandsMap = new HashMap<int, const char*>;
        keyPressCommandsMap = new HashMap<int, const char*>;

        for (unsigned i = 0; i < _countof(keyDownEntries); i++)
            keyDownCommandsMap->set(keyDownEntries[i].modifiers << 16 | keyDownEntries[i].virtualKey, keyDownEntries[i].name);