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// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/autocomplete/edit_drop_target.h"
#include "base/string_util.h"
#include "chrome/browser/autocomplete/autocomplete_edit.h"
#include "chrome/common/os_exchange_data.h"
#include "googleurl/src/gurl.h"
namespace {
// A helper method for determining a valid DROPEFFECT given the allowed
// DROPEFFECTS. We prefer copy over link.
DWORD CopyOrLinkDropEffect(DWORD effect) {
if (effect & DROPEFFECT_COPY)
return DROPEFFECT_COPY;
if (effect & DROPEFFECT_LINK)
return DROPEFFECT_LINK;
return DROPEFFECT_NONE;
}
}
EditDropTarget::EditDropTarget(AutocompleteEditView* edit)
: BaseDropTarget(edit->m_hWnd),
edit_(edit),
drag_has_url_(false),
drag_has_string_(false) {
}
DWORD EditDropTarget::OnDragEnter(IDataObject* data_object,
DWORD key_state,
POINT cursor_position,
DWORD effect) {
OSExchangeData os_data(data_object);
drag_has_url_ = os_data.HasURL();
drag_has_string_ = !drag_has_url_ && os_data.HasString();
if (drag_has_url_) {
if (edit_->in_drag()) {
// The edit we're associated with originated the drag. No point in
// allowing the user to drop back on us.
drag_has_url_ = false;
}
// NOTE: it would be nice to visually show all the text is going to
// be replaced by selecting all, but this caused painting problems. In
// particular the flashing caret would appear outside the edit! For now
// we stick with no visual indicator other than that shown own the mouse
// cursor.
}
return OnDragOver(data_object, key_state, cursor_position, effect);
}
DWORD EditDropTarget::OnDragOver(IDataObject* data_object,
DWORD key_state,
POINT cursor_position,
DWORD effect) {
if (drag_has_url_)
return CopyOrLinkDropEffect(effect);
if (drag_has_string_) {
UpdateDropHighlightPosition(cursor_position);
if (edit_->drop_highlight_position() == -1 && edit_->in_drag())
return DROPEFFECT_NONE;
if (edit_->in_drag()) {
// The edit we're associated with originated the drag. Do the normal drag
// behavior.
DCHECK((effect & DROPEFFECT_COPY) && (effect & DROPEFFECT_MOVE));
return (key_state & MK_CONTROL) ? DROPEFFECT_COPY : DROPEFFECT_MOVE;
}
// Our edit didn't originate the drag, only allow link or copy.
return CopyOrLinkDropEffect(effect);
}
return DROPEFFECT_NONE;
}
void EditDropTarget::OnDragLeave(IDataObject* data_object) {
ResetDropHighlights();
}
DWORD EditDropTarget::OnDrop(IDataObject* data_object,
DWORD key_state,
POINT cursor_position,
DWORD effect) {
OSExchangeData os_data(data_object);
if (drag_has_url_) {
GURL url;
std::wstring title;
if (os_data.GetURLAndTitle(&url, &title)) {
edit_->SetUserText(UTF8ToWide(url.spec()));
edit_->model()->AcceptInput(CURRENT_TAB, true);
return CopyOrLinkDropEffect(effect);
}
} else if (drag_has_string_) {
int string_drop_position = edit_->drop_highlight_position();
std::wstring text;
if ((string_drop_position != -1 || !edit_->in_drag()) &&
os_data.GetString(&text)) {
DCHECK(string_drop_position == -1 ||
((string_drop_position >= 0) &&
(string_drop_position <= edit_->GetTextLength())));
const DWORD drop_operation =
OnDragOver(data_object, key_state, cursor_position, effect);
if (edit_->in_drag()) {
if (drop_operation == DROPEFFECT_MOVE)
edit_->MoveSelectedText(string_drop_position);
else
edit_->InsertText(string_drop_position, text);
} else {
edit_->PasteAndGo(CollapseWhitespace(text, true));
}
ResetDropHighlights();
return drop_operation;
}
}
ResetDropHighlights();
return DROPEFFECT_NONE;
}
void EditDropTarget::UpdateDropHighlightPosition(
const POINT& cursor_screen_position) {
if (drag_has_string_) {
POINT client_position = cursor_screen_position;
ScreenToClient(edit_->m_hWnd, &client_position);
int drop_position = edit_->CharFromPos(client_position);
if (edit_->in_drag()) {
// Our edit originated the drag, don't allow a drop if over the selected
// region.
LONG sel_start, sel_end;
edit_->GetSel(sel_start, sel_end);
if ((sel_start != sel_end) && (drop_position >= sel_start) &&
(drop_position <= sel_end))
drop_position = -1;
} else {
// A drop from a source other than the edit replaces all the text, so
// we don't show the drop location. See comment in OnDragEnter as to why
// we don't try and select all here.
drop_position = -1;
}
edit_->SetDropHighlightPosition(drop_position);
}
}
void EditDropTarget::ResetDropHighlights() {
if (drag_has_string_)
edit_->SetDropHighlightPosition(-1);
}
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