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      1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #include "ui/views/widget/aero_tooltip_manager.h"
      6 
      7 #include <windows.h>
      8 #include <commctrl.h>
      9 #include <shlobj.h>
     10 
     11 #include "base/bind.h"
     12 #include "base/message_loop/message_loop.h"
     13 #include "ui/base/l10n/l10n_util_win.h"
     14 #include "ui/gfx/point.h"
     15 #include "ui/gfx/win/dpi.h"
     16 #include "ui/gfx/win/hwnd_util.h"
     17 
     18 namespace views {
     19 
     20 ///////////////////////////////////////////////////////////////////////////////
     21 // AeroTooltipManager, public:
     22 
     23 AeroTooltipManager::AeroTooltipManager(Widget* widget)
     24     : TooltipManagerWin(widget),
     25       initial_delay_(0) {
     26 }
     27 
     28 AeroTooltipManager::~AeroTooltipManager() {
     29   if (initial_timer_)
     30     initial_timer_->Disown();
     31 }
     32 
     33 void AeroTooltipManager::OnMouse(UINT u_msg, WPARAM w_param, LPARAM l_param) {
     34   if (u_msg == WM_MOUSELEAVE) {
     35     last_mouse_pos_.SetPoint(-1, -1);
     36     UpdateTooltip();
     37     return;
     38   }
     39 
     40   if (initial_timer_)
     41     initial_timer_->Disown();
     42 
     43   if (u_msg == WM_MOUSEMOVE || u_msg == WM_NCMOUSEMOVE) {
     44     gfx::Point mouse_pos_in_pixels(l_param);
     45     gfx::Point mouse_pos = gfx::win::ScreenToDIPPoint(mouse_pos_in_pixels);
     46     if (u_msg == WM_NCMOUSEMOVE) {
     47       // NC message coordinates are in screen coordinates.
     48       POINT temp = mouse_pos_in_pixels.ToPOINT();
     49       ::MapWindowPoints(HWND_DESKTOP, GetParent(), &temp, 1);
     50       mouse_pos_in_pixels.SetPoint(temp.x, temp.y);
     51       mouse_pos = gfx::win::ScreenToDIPPoint(mouse_pos_in_pixels);
     52     }
     53     if (last_mouse_pos_ != mouse_pos) {
     54       last_mouse_pos_ = mouse_pos;
     55       UpdateTooltip(mouse_pos);
     56     }
     57 
     58     // Delay opening of the tooltip just in case the user moves their
     59     // mouse to another control. We defer this from Init because we get
     60     // zero if we query it too soon.
     61     if (!initial_delay_) {
     62       initial_delay_ = static_cast<int>(
     63           ::SendMessage(tooltip_hwnd_, TTM_GETDELAYTIME, TTDT_INITIAL, 0));
     64     }
     65     initial_timer_ = new InitialTimer(this);
     66     initial_timer_->Start(initial_delay_);
     67   } else {
     68     // Hide the tooltip and cancel any timers.
     69     ::SendMessage(tooltip_hwnd_, TTM_POP, 0, 0);
     70     ::SendMessage(tooltip_hwnd_, TTM_TRACKACTIVATE, false, (LPARAM)&toolinfo_);
     71     return;
     72   }
     73 }
     74 
     75 ///////////////////////////////////////////////////////////////////////////////
     76 // AeroTooltipManager, private:
     77 
     78 void AeroTooltipManager::OnTimer() {
     79   initial_timer_ = NULL;
     80 
     81   POINT pt = last_mouse_pos_.ToPOINT();
     82   ::ClientToScreen(GetParent(), &pt);
     83 
     84   // Set the position and visibility.
     85   if (!tooltip_showing_) {
     86     ::SendMessage(tooltip_hwnd_, TTM_POPUP, 0, 0);
     87     ::SendMessage(tooltip_hwnd_, TTM_TRACKPOSITION, 0, MAKELPARAM(pt.x, pt.y));
     88     ::SendMessage(tooltip_hwnd_, TTM_TRACKACTIVATE, true, (LPARAM)&toolinfo_);
     89   }
     90 }
     91 
     92 ///////////////////////////////////////////////////////////////////////////////
     93 // AeroTooltipManager::InitialTimer
     94 
     95 AeroTooltipManager::InitialTimer::InitialTimer(AeroTooltipManager* manager)
     96     : manager_(manager) {
     97 }
     98 
     99 void AeroTooltipManager::InitialTimer::Start(int time) {
    100   base::MessageLoop::current()->PostDelayedTask(
    101       FROM_HERE,
    102       base::Bind(&InitialTimer::Execute, this),
    103       base::TimeDelta::FromMilliseconds(time));
    104 }
    105 
    106 void AeroTooltipManager::InitialTimer::Disown() {
    107   manager_ = NULL;
    108 }
    109 
    110 void AeroTooltipManager::InitialTimer::Execute() {
    111   if (manager_)
    112     manager_->OnTimer();
    113 }
    114 
    115 }  // namespace views
    116