Add base to the repository.

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@8 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 187 insertions, 0 deletions

diff --git a/base/base_drop_target.cc b/base/base_drop_target.cc
new file mode 100644
index 0000000..f210381
--- /dev/null
+++ b/base/base_drop_target.cc
@@ -0,0 +1,187 @@
+// Copyright 2008, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//    * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//    * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//    * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#include <windows.h>
+#include <shlobj.h>
+
+#include "base/base_drop_target.h"
+
+#include "base/logging.h"
+
+///////////////////////////////////////////////////////////////////////////////
+
+IDropTargetHelper* BaseDropTarget::cached_drop_target_helper_ = NULL;
+
+BaseDropTarget::BaseDropTarget(HWND hwnd)
+    : suspend_(false),
+      ref_count_(0),
+      hwnd_(hwnd) {
+  DCHECK(hwnd);
+  HRESULT result = RegisterDragDrop(hwnd, this);
+}
+
+BaseDropTarget::~BaseDropTarget() {
+}
+
+// static
+IDropTargetHelper* BaseDropTarget::DropHelper() {
+  if (!cached_drop_target_helper_) {
+    CoCreateInstance(CLSID_DragDropHelper, 0, CLSCTX_INPROC_SERVER,
+                     IID_IDropTargetHelper,
+                     reinterpret_cast<void**>(&cached_drop_target_helper_));
+  }
+  return cached_drop_target_helper_;
+}
+
+///////////////////////////////////////////////////////////////////////////////
+// BaseDropTarget, IDropTarget implementation:
+
+HRESULT BaseDropTarget::DragEnter(IDataObject* data_object,
+                                  DWORD key_state,
+                                  POINTL cursor_position,
+                                  DWORD* effect) {
+  // Tell the helper that we entered so it can update the drag image.
+  IDropTargetHelper* drop_helper = DropHelper();
+  if (drop_helper) {
+    drop_helper->DragEnter(GetHWND(), data_object,
+                           reinterpret_cast<POINT*>(&cursor_position), *effect);
+  }
+
+  // You can't drag and drop within the same HWND.
+  if (suspend_) {
+    *effect = DROPEFFECT_NONE;
+    return S_OK;
+  }
+  current_data_object_ = data_object;
+  POINT screen_pt = { cursor_position.x, cursor_position.y };
+  *effect = OnDragEnter(current_data_object_, key_state, screen_pt, *effect);
+  return S_OK;
+}
+
+HRESULT BaseDropTarget::DragOver(DWORD key_state,
+                                 POINTL cursor_position,
+                                 DWORD* effect) {
+  // Tell the helper that we moved over it so it can update the drag image.
+  IDropTargetHelper* drop_helper = DropHelper();
+  if (drop_helper)
+    drop_helper->DragOver(reinterpret_cast<POINT*>(&cursor_position), *effect);
+
+  if (suspend_) {
+    *effect = DROPEFFECT_NONE;
+    return S_OK;
+  }
+
+  POINT screen_pt = { cursor_position.x, cursor_position.y };
+  *effect = OnDragOver(current_data_object_, key_state, screen_pt, *effect);
+  return S_OK;
+}
+
+HRESULT BaseDropTarget::DragLeave() {
+  // Tell the helper that we moved out of it so it can update the drag image.
+  IDropTargetHelper* drop_helper = DropHelper();
+  if (drop_helper)
+    drop_helper->DragLeave();
+
+  OnDragLeave(current_data_object_);
+
+  current_data_object_ = NULL;
+  return S_OK;
+}
+
+HRESULT BaseDropTarget::Drop(IDataObject* data_object,
+                             DWORD key_state,
+                             POINTL cursor_position,
+                             DWORD* effect) {
+  // Tell the helper that we dropped onto it so it can update the drag image.
+  IDropTargetHelper* drop_helper = DropHelper();
+  if (drop_helper) {
+    drop_helper->Drop(current_data_object_,
+                      reinterpret_cast<POINT*>(&cursor_position), *effect);
+  }
+
+  if (suspend_) {
+    *effect = DROPEFFECT_NONE;
+    return S_OK;
+  }
+
+  POINT screen_pt = { cursor_position.x, cursor_position.y };
+  *effect = OnDrop(current_data_object_, key_state, screen_pt, *effect);
+  return S_OK;
+}
+
+///////////////////////////////////////////////////////////////////////////////
+// BaseDropTarget, IUnknown implementation:
+
+HRESULT BaseDropTarget::QueryInterface(const IID& iid, void** object) {
+  *object = NULL;
+  if (IsEqualIID(iid, IID_IUnknown) || IsEqualIID(iid, IID_IDropTarget)) {
+    *object = this;
+  } else {
+    return E_NOINTERFACE;
+  }
+  AddRef();
+  return S_OK;
+}
+
+ULONG BaseDropTarget::AddRef() {
+  return InterlockedIncrement(&ref_count_);
+}
+
+ULONG BaseDropTarget::Release() {
+  if (InterlockedDecrement(&ref_count_) == 0) {
+    ULONG copied_refcnt = ref_count_;
+    delete this;
+    return copied_refcnt;
+  }
+  return ref_count_;
+}
+
+DWORD BaseDropTarget::OnDragEnter(IDataObject* data_object,
+                                  DWORD key_state,
+                                  POINT cursor_position,
+                                  DWORD effect) {
+  return DROPEFFECT_NONE;
+}
+
+DWORD BaseDropTarget::OnDragOver(IDataObject* data_object,
+                                 DWORD key_state,
+                                 POINT cursor_position,
+                                 DWORD effect) {
+  return DROPEFFECT_NONE;
+}
+
+void BaseDropTarget::OnDragLeave(IDataObject* data_object) {
+}
+
+DWORD BaseDropTarget::OnDrop(IDataObject* data_object,
+                             DWORD key_state,
+                             POINT cursor_position,
+                             DWORD effect) {
+  return DROPEFFECT_NONE;
+}