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tray-button.c
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tray-button.c
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/* Task tray button.
* Displays a button on the task tray.
*
* Copyright 2018 Raising the Floor - International
*
* Licensed under the New BSD license. You may not use this file except in
* compliance with this License.
*
* The R&D leading to these results received funding from the
* Department of Education - Grant H421A150005 (GPII-APCP). However,
* these results do not necessarily represent the policy of the
* Department of Education, and you should not assume endorsement by the
* Federal Government.
*
* You may obtain a copy of the License at
* https://github.com/GPII/universal/blob/master/LICENSE.txt
*/
#define UNICODE 1
#define _UNICODE 1
#include <Windows.h>
#include <uxtheme.h>
#include <stdio.h>
#include <WinBase.h>
#include <shlwapi.h>
#include <strsafe.h>
#pragma comment (lib, "User32.lib")
#pragma comment (lib, "Kernel32.lib")
#pragma comment (lib, "gdi32.lib")
#pragma comment (lib, "uxtheme.lib")
#pragma comment (lib, "Msimg32.lib")
#pragma comment (lib, "Shlwapi.lib")
#define BUTTON_CLASS L"GPII-TrayButton"
// Commands sent from GPII
#define GPII_COMMAND_ICON L"ICON"
#define GPII_COMMAND_ICON_HC L"ICON_HC"
#define GPII_COMMAND_TOOLTIP L"TOOLTIP"
#define GPII_COMMAND_DESTROY L"DESTROY"
#define GPII_COMMAND_STATE L"STATE"
#define GPII_COMMAND_HWND L"HWND"
// Notifications sent to GPII
#define GPII_MSG_UPDATE L"UPDATE"
#define GPII_MSG_CLICK L"CLICK"
#define GPII_MSG_SHOWMENU L"SHOWMENU"
#define GPII_MSG_MOUSEENTER L"MOUSEENTER"
#define GPII_MSG_MOUSELEAVE L"MOUSELEAVE"
#define GPII_MSG_POSITION L"POSITION"
#define true TRUE
#define false FALSE
#define null NULL
#define ICON_SIZE 16
#define BUTTON_WIDTH 24
// Button states
#define STATE_NORMAL 1
#define STATE_HOVER 2
#define STATE_PRESSED 4
#define STATE_CHECKED 8
/** Current state of the button */
int buttonState = STATE_NORMAL;
/** last known window sizes */
RECT taskRect = { 0 }, notifyRect = { 0 }, trayClient = { 0 }, windowRect = { 0 };
HWND buttonWindow = null;
HWND tooltipWindow = null;
HWND morphicWindow = null;
BOOL highContrast = false;
UINT currentDpi = 0;
int iconSize = ICON_SIZE;
/** The icon of the button */
HICON hIcon = null;
WCHAR *iconFile = null;
/** The icon used for high-contrast */
WCHAR *iconFileHC = null;
/** WM_SHELLHOOKMESSAGE */
UINT shellMessage = 0;
/** true if the button destruction is intentional */
BOOL die = false;
#define log(FMT, ...) {fwprintf(stderr, L ## FMT L"\n", __VA_ARGS__); fflush(stderr);}
#define fail(FMT, ...) {fwprintf(stderr, L"fail: " L ## FMT, __VA_ARGS__); fwprintf(stderr, L"(win32:%u)\n", GetLastError()); fflush(stderr);}
#ifdef _DEBUG
# define debug(FMT, ...) log(FMT, __VA_ARGS__)
#else
# define debug(FMT, ...)
#endif
/**
* Convert the value based on 96dpi to the current dpi.
*/
#define fixDpi(size) MulDiv(size, currentDpi, 96)
/**
* Cause the button to be redrawn.
*/
void redraw()
{
RedrawWindow(buttonWindow, null, null, RDW_ERASE | RDW_INVALIDATE | RDW_FRAME | RDW_ALLCHILDREN);
}
/**
* Get the taskbar window handle.
* @return The taskbar's window handle.
*/
HWND getTaskbarWindow()
{
return FindWindow(L"Shell_TrayWnd", null);
}
#define TIMER_RESIZE 1
#define TIMER_CHECK 2
#define TIMER_CHECK_DELAY 5000
void setImage(WCHAR *file);
/**
* Hide the button
*/
void hideButton()
{
iconFile = null;
if (hIcon) {
DestroyIcon(hIcon);
hIcon = null;
}
if (IsWindow(buttonWindow)) {
ShowWindow(buttonWindow, SW_HIDE);
}
HANDLE taskbar = getTaskbarWindow();
if (taskbar) {
// Make the taskbar adjust the sizes
SendMessage(taskbar, WM_ENTERSIZEMOVE, 0, 0);
SendMessage(taskbar, WM_EXITSIZEMOVE, 0, 0);
}
}
UINT(WINAPI *my_GetDpiForWindow)(HWND) = null;
BOOL noGetDpiForWindow = false;
UINT getDpi(HWND window)
{
UINT result = 0;
if (!noGetDpiForWindow) {
if (!my_GetDpiForWindow) {
// Manually get the GetDpiForWindow function - it's only available on Windows 10.1607 and it's not
// defined in the SDK that's currently used.
HINSTANCE user32 = LoadLibrary(L"user32.dll");
if (user32) {
*(void**)&my_GetDpiForWindow = GetProcAddress(user32, "GetDpiForWindow");
}
noGetDpiForWindow = !my_GetDpiForWindow;
}
if (my_GetDpiForWindow) {
result = my_GetDpiForWindow(window);
}
}
if (!result) {
result = currentDpi ? currentDpi : 96;
}
return result;
}
/**
* Move the button in between the task list and notification icons by shrinking the task list.
*
* @param force true to always resize, even if not required.
* @return true if resize was required.
*/
BOOL positionTrayWindows(BOOL force)
{
debug("positionTrayWindows");
if (!buttonWindow) {
return false;
}
if (!hIcon) {
return false;
}
// Task bar
HWND tray = getTaskbarWindow();
// Container of the window list (and toolbars)
HWND tasks = FindWindowEx(tray, null, L"ReBarWindow32", null);
// The notification icons
HWND notify = FindWindowEx(tray, null, L"TrayNotifyWnd", null);
debug("tray:%u tasks:%u notify:%u", tray, tasks, notify);
// Current DPI
UINT dpi = getDpi(tray);
if (dpi != currentDpi) {
currentDpi = dpi;
setImage(iconFile);
return true;
}
// Get the dimensions of both windows.
RECT newTaskRect, newNotifyRect, newTrayClient;
RECT buttonRect = { 0 };
GetWindowRect(tasks, &newTaskRect);
GetWindowRect(notify, &newNotifyRect);
GetClientRect(tray, &newTrayClient);
// Have they changed since last time?
BOOL changed = !EqualRect(&taskRect, &newTaskRect)
|| !EqualRect(¬ifyRect, &newNotifyRect)
|| !EqualRect(&trayClient, &newTrayClient);
CopyRect(&taskRect, &newTaskRect);
CopyRect(¬ifyRect, &newNotifyRect);
CopyRect(&trayClient, &newTrayClient);
// Check the orientation
RECT trayRect;
GetWindowRect(tray, &trayRect);
BOOL vert = trayRect.top == 0 && trayRect.bottom > GetSystemMetrics(SM_CYFULLSCREEN) - 10;
if (vert) {
// Shrink the tasks window
taskRect.bottom = notifyRect.top - fixDpi(BUTTON_WIDTH);
// Put the button between
buttonRect.top = taskRect.bottom;
buttonRect.bottom = notifyRect.top;
buttonRect.left = highContrast ? 1 : 0;
buttonRect.right = trayClient.right;
} else {
// Check the reading direction - if the notification icons are left of the task list, then assume right-to-left.
BOOL rtl = notifyRect.left < taskRect.left;
if (rtl) {
// notification area is on the left
// Shrink the tasks window
taskRect.left = notifyRect.right + fixDpi(BUTTON_WIDTH);
// Put the button between
buttonRect.left = trayClient.right - taskRect.left;
buttonRect.right = trayClient.right - notifyRect.right;
} else {
// notification area is on the right (the common way)
// Shrink the tasks window
taskRect.right = notifyRect.left - fixDpi(BUTTON_WIDTH);
// Put the button between
buttonRect.left = taskRect.right;
buttonRect.right = notifyRect.left;
}
buttonRect.top = highContrast ? 1 : 0;
buttonRect.bottom = trayClient.bottom;
}
if (!force || !changed) {
// See if the button needs to be moved
RECT currentRect;
GetWindowRect(buttonWindow, ¤tRect);
MapWindowPoints(HWND_DESKTOP, tray, (POINT*)¤tRect, 2);
changed = changed || !EqualRect(&buttonRect, ¤tRect);
}
if (force || changed) {
// shrink the task list
SetWindowPos(tasks, HWND_BOTTOM,
0, 0,
taskRect.right - taskRect.left,
taskRect.bottom - taskRect.top,
SWP_NOACTIVATE | SWP_NOMOVE);
// Move the button between the tasks and notification area
SetWindowPos(buttonWindow, HWND_TOP,
buttonRect.left, buttonRect.top,
buttonRect.right - buttonRect.left,
buttonRect.bottom - buttonRect.top,
SWP_NOACTIVATE | SWP_SHOWWINDOW);
redraw();
}
if (force || changed) {
SetTimer(buttonWindow, TIMER_RESIZE, 100, NULL);
SetTimer(buttonWindow, TIMER_CHECK, 1000, null);
} else {
KillTimer(buttonWindow, TIMER_RESIZE);
}
if (changed) {
// Inform gpii about the new position.
RECT currentRect;
GetWindowRect(buttonWindow, ¤tRect);
if (!EqualRect(&windowRect, ¤tRect)) {
windowRect = currentRect;
sendToGpii(GPII_MSG_POSITION,
MAKELONG(windowRect.left, windowRect.top),
MAKELONG(windowRect.right - windowRect.left, windowRect.bottom - windowRect.top));
}
}
return changed;
}
/**
* Update the state of the button, and cause a redraw. The state is a bitmask of STATE_*
* @param newState
*/
void updateState(int newState)
{
buttonState = newState;
redraw();
}
/** Set a state */
#define setState(F) updateState(buttonState | (F))
/** Un-set a state */
#define unsetState(F) updateState(buttonState & ~(F))
/** Check a state */
#define hasState(F) (buttonState & (F))
/**
* Determine if high-contrast is currently applied.
* @return TRUE if the setting has changed.
*/
BOOL checkHighContrast()
{
HIGHCONTRAST hc = { 0 };
hc.cbSize = sizeof(hc);
SystemParametersInfo(SPI_GETHIGHCONTRAST, hc.cbSize, &hc, 0);
BOOL last = highContrast;
highContrast = (hc.dwFlags & HCF_HIGHCONTRASTON) != 0;
return highContrast != last;
}
/**
* Send a message to the main GPII process.
* @return TRUE if the window exists.
*/
BOOL sendToGpii(WCHAR *msg, WPARAM wParam, LPARAM lParam)
{
debug("sendToGpii(%s,%u,%u)", msg, wParam, lParam);
wprintf(L"%s %u %u\r\n", msg, wParam, lParam);
fflush(stdout);
return true;
}
/**
* Draws a translucent rectangle.
* @param dc The device context to draw on.
* @param rc The rectangle
* @param color Rectangle colour
* @param alpha Alpha amount, 0 (transparent) - 0xff (opaque)
*/
void AlphaRect(HDC dc, RECT rc, COLORREF color, BYTE alpha)
{
// GDI doesn't have a concept of semi-transparent pixels - the only function that honours them is AlphaBlend.
// Create a bitmap containing a single pixel, and use AlphaBlend to stretch it to the size of the rect.
// The bitmap
int pixel;
BITMAPINFO bmi = { 0 };
bmi.bmiHeader.biSize = sizeof(bmi.bmiHeader);
bmi.bmiHeader.biWidth = bmi.bmiHeader.biHeight = 1;
bmi.bmiHeader.biPlanes = 1;
bmi.bmiHeader.biBitCount = 32;
// The pixel
pixel = (
((alpha * GetRValue(color) / 0xff) << 16) |
((alpha * GetGValue(color) / 0xff) << 8) |
(alpha * GetBValue(color) / 0xff)
);
pixel = pixel | (alpha << 24);
// Make the bitmap DC.
int *bits;
HDC dcPixel = CreateCompatibleDC(dc);
HBITMAP bmpPixel = CreateDIBSection(dcPixel, &bmi, DIB_RGB_COLORS, &bits, null, 0);
HBITMAP bmpOrig = SelectObject(dcPixel, bmpPixel);
*bits = pixel;
// Draw the "rectangle"
BLENDFUNCTION bf = { AC_SRC_OVER, 0, 255, AC_SRC_ALPHA };
AlphaBlend(dc, rc.left, rc.top, rc.right - rc.left, rc.bottom - rc.top, dcPixel, 0, 0, 1, 1, bf);
SelectObject(dcPixel, bmpOrig);
DeleteObject(bmpPixel);
DeleteDC(dcPixel);
}
/**
* Called from WM_PAINT to perform the drawing of the button.
*/
void paint()
{
RECT rc;
HDC dc, dcPaint;
PAINTSTRUCT ps;
GetClientRect(buttonWindow, &rc);
// Start the buffer
dcPaint = BeginPaint(buttonWindow, &ps);
HPAINTBUFFER paintBuffer = BeginBufferedPaint(dcPaint, &rc, BPBF_TOPDOWNDIB, null, &dc);
BufferedPaintClear(paintBuffer, null);
int x = (rc.right - iconSize) / 2;
int y = (rc.bottom - iconSize) / 2;
if (highContrast) {
UINT backcolor = COLOR_WINDOW;
UINT forecolor = COLOR_WINDOWTEXT;
if (hasState(STATE_CHECKED)) {
forecolor = COLOR_HIGHLIGHT;
}
if (hasState(STATE_HOVER)) {
backcolor = COLOR_HOTLIGHT;
forecolor = COLOR_HIGHLIGHTTEXT;
}
// Get the real colour
backcolor = GetSysColor(backcolor);
forecolor = GetSysColor(forecolor);
// Create an off-screen copy of the icon
HDC dcBuf = CreateCompatibleDC(dc);
// Make the colours of the icon what they need to be by manually changing each pixel
// TODO: Pre-generate
// Create a buffer bitmap
BITMAPINFO bmi = { 0 };
bmi.bmiHeader.biSize = sizeof(bmi.bmiHeader);
bmi.bmiHeader.biWidth = rc.right;
bmi.bmiHeader.biHeight = rc.bottom;
bmi.bmiHeader.biPlanes = 1;
bmi.bmiHeader.biBitCount = 32;
UINT *pixels;
HBITMAP bmpBuf = CreateDIBSection(dcBuf, &bmi, DIB_RGB_COLORS, (void **) &pixels, null, 0);
HBITMAP origBmp = SelectObject(dcBuf, bmpBuf);
// Clear the buffer
AlphaRect(dcBuf, rc, 0, 255);
// Draw the icon
DrawIconEx(dcBuf, x, y, hIcon, iconSize, iconSize, 0, null, DI_NORMAL);
// Change the pixels to the foreground colour, while taking the image's anti-aliasing into consideration.
int len = rc.right * rc.bottom;
UINT *p = pixels;
#define TO_RGB(C) ((C << 16) & 0xff0000) | (C & 0xff00) | ((C >> 16) & 0xff)
#define BLACK 0xff000000
#define WHITE 0xffffffff
UINT bg = TO_RGB(backcolor), fg = TO_RGB(forecolor);
BYTE r1 = GetRValue(fg), g1 = GetGValue(fg), b1 = GetBValue(fg);
BYTE r2 = GetRValue(bg), g2 = GetGValue(bg), b2 = GetBValue(bg);
for (int n = 0; n < len; n++, p++) {
// Don't calculate full black or white
if (*p == BLACK) {
*p = bg;
} else if (*p == WHITE) {
*p = fg;
} else {
// Make a colour the same distance between the background and foreground as the original's distance
// between black and white (assumes the original image is white on black).
double a = (*p & 0xff) / 255.0;
*p = RGB(
r1 * a + r2 * (1.0 - a),
g1 * a + g2 * (1.0 - a),
b1 * a + b2 * (1.0 - a)
);
}
}
// buffer -> screen (buffer)
AlphaRect(dc, rc, 0, 255);
BitBlt(dc, 0, 0, rc.right, rc.bottom, dcBuf, 0, 0, SRCINVERT);
SelectObject(dcBuf, origBmp);
DeleteObject(bmpBuf);
DeleteObject(dcBuf);
} else {
// Draw the not-high-contrast icon
// Values come from what looks right.
BYTE alpha = 0;
if (hasState(STATE_PRESSED)) {
alpha = 10;
} else if (hasState(STATE_HOVER)) {
alpha = 25;
}
if (alpha) {
AlphaRect(dc, rc, RGB(255, 255, 255), alpha);
}
DrawIconEx(dc, x, y, hIcon, iconSize, iconSize, 0, 0, DI_NORMAL);
}
// Commit the buffer.
EndBufferedPaint(paintBuffer, true);
EndPaint(buttonWindow, &ps);
}
/**
* Sets the icon.
* @param file The icon file.
*/
void setImage(WCHAR *file)
{
if (hIcon) {
DestroyIcon(hIcon);
hIcon = null;
}
// If the passed file points to the current one, then don't free+dup it
if (iconFile != file) {
if (iconFile) {
LocalFree(iconFile);
}
iconFile = file ? StrDup(file) : null;
}
iconSize = fixDpi(ICON_SIZE);
WCHAR *f = (highContrast && iconFileHC) ? iconFileHC : iconFile;
if (iconSize && f) {
hIcon = LoadImage(null, f, IMAGE_ICON, iconSize, iconSize, LR_LOADFROMFILE);
if (!hIcon) {
fail("LoadImage %p", f);
}
}
positionTrayWindows(true);
}
/**
* Sets the current tooltip
* @param tooltip
*/
void setToolTip(WCHAR *tooltip)
{
if (!tooltipWindow) {
tooltipWindow = CreateWindowEx(0,
TOOLTIPS_CLASS, NULL,
WS_POPUP | TTS_ALWAYSTIP | TTS_NOPREFIX | TTS_BALLOON,
0, 0,
0, 0,
buttonWindow,
NULL, NULL, NULL);
}
TOOLINFO ti = { 0 };
ti.cbSize = sizeof(ti);
ti.hwnd = buttonWindow;
ti.uFlags = TTF_SUBCLASS;
ti.lpszText = tooltip;
GetClientRect(buttonWindow, &ti.rect);
SendMessage(tooltipWindow, TTM_ADDTOOL, 0, (LPARAM)&ti);
}
/**
* Called when a message from gpii has been received.
* @param command The command
* @param data The data
*/
void gotGpiiMessage(WCHAR *command, WCHAR* data)
{
debug("gotGpiiMessage(%s,%s)", command, data);
if (CompareStringOrdinal(command, -1, GPII_COMMAND_ICON, -1, true) == CSTR_EQUAL) {
setImage(data);
} else if (CompareStringOrdinal(command, -1, GPII_COMMAND_ICON_HC, -1, true) == CSTR_EQUAL) {
if (iconFileHC) {
LocalFree(iconFileHC);
}
iconFileHC = StrDup(data);
setImage(iconFile);
} else if (CompareStringOrdinal(command, -1, GPII_COMMAND_TOOLTIP, -1, true) == CSTR_EQUAL) {
setToolTip(data);
} else if (CompareStringOrdinal(command, -1, GPII_COMMAND_HWND, -1, true) == CSTR_EQUAL) {
morphicWindow = (HWND)StrToInt(data);
} else if (CompareStringOrdinal(command, -1, GPII_COMMAND_STATE, -1, true) == CSTR_EQUAL) {
BOOL on = CompareStringOrdinal(data, -1, L"true", -1, true) == CSTR_EQUAL;
if (on) {
setState(STATE_CHECKED);
} else {
unsetState(STATE_CHECKED);
}
} else if (CompareStringOrdinal(command, -1, GPII_COMMAND_DESTROY, -1, true) == CSTR_EQUAL) {
DestroyWindow(buttonWindow);
PostQuitMessage(0);
die = true;
}
}
WCHAR inputBuffer[0xfff] = {0};
int inputLength = 0;
/**
* An input line from stdin
*/
void gotInput(WCHAR *input, int len) {
// Ignore the BOM
if (*input == 0xfeff) {
input++;
}
StringCbCat(inputBuffer, sizeof(inputBuffer), input);
WCHAR *start = inputBuffer;
WCHAR *eol;
// Break the buffer into lines.
while ((eol = StrChr(start, '\n'))) {
// Terminate at the end of line.
if (eol > start && *(eol - 1) == L'\r') {
*(eol - 1) = L'\0';
} else {
*eol = L'\0';
}
WCHAR *command = start;
WCHAR *data = StrChr(command, ' ');
while (data && iswspace(*data)) {
*data = L'\0';
data++;
}
gotGpiiMessage(command, data);
start = eol + 1;
}
// Move the rest of the buffer to the beginning.
if (wcslen(start)) {
WCHAR *t = StrDup(start);
StringCbCopy(inputBuffer, sizeof(inputBuffer), t);
LocalFree(t);
} else {
*inputBuffer = L'\0';
}
}
LRESULT CALLBACK buttonWndProc(HWND hwnd, UINT msg, WPARAM wp, LPARAM lp)
{
switch (msg) {
case WM_CREATE:
debug("WM_CREATE");
if (!buttonWindow) {
buttonWindow = hwnd;
}
// Ask gpii for an update.
sendToGpii(GPII_MSG_UPDATE, 0, 0);
break;
case WM_MOUSEMOVE:
// Draw the highlight
if (!hasState(STATE_HOVER)) {
// Inform gpii
sendToGpii(GPII_MSG_MOUSEENTER, 0, 0);
// Detect when the mouse leaves.
TRACKMOUSEEVENT tme = { 0 };
tme.cbSize = sizeof(tme);
tme.dwFlags = TME_LEAVE;
tme.hwndTrack = hwnd;
TrackMouseEvent(&tme);
setState(STATE_HOVER);
}
break;
case WM_MOUSELEAVE:
sendToGpii(GPII_MSG_MOUSELEAVE, 0, 0);
unsetState(STATE_HOVER | STATE_PRESSED);
break;
case WM_LBUTTONDOWN:
setState(STATE_PRESSED);
break;
case WM_LBUTTONUP:
// Activate the GPII window so the popup can take focus
SetForegroundWindow(morphicWindow);
sendToGpii(GPII_MSG_CLICK, 0, 0);
unsetState(STATE_PRESSED);
break;
case WM_RBUTTONUP:
// Activate the GPII window so the menu can take focus
SetForegroundWindow(morphicWindow);
sendToGpii(GPII_MSG_SHOWMENU, 0, 0);
return 0;
case WM_TIMER:
debug("timer %u", wp);
switch (wp) {
case TIMER_CHECK:
SetTimer(buttonWindow, TIMER_CHECK, TIMER_CHECK_DELAY, null);
redraw();
// fall through
case TIMER_RESIZE:
positionTrayWindows(false);
break;
default:
break;
}
break;
case WM_SIZE:
case WM_WINDOWPOSCHANGED:
positionTrayWindows(true);
break;
case WM_ERASEBKGND:
positionTrayWindows(false);
break;
case WM_PAINT:
paint();
break;
case WM_DPICHANGED:
// Set the current one to the given one (for < win10), then call getDpi to make the real check
currentDpi = LOWORD(wp);
getDpi(buttonWindow);
setImage(iconFile);
break;
case WM_SETTINGCHANGE:
if (checkHighContrast()) {
// If high-contrast has changed, the icon will need to be reloaded.
setImage(iconFile);
}
// fall through
case WM_DISPLAYCHANGE:
positionTrayWindows(true);
break;
case WM_NCDESTROY:
case WM_DESTROY:
PostQuitMessage(die ? 0 : 1);
break;
default:
if (msg == shellMessage) {
// The taskbar reacts to shell messages, so there's a good chance something will need to be redrawn.
if (!positionTrayWindows(false)) {
redraw();
}
}
break;
}
return DefWindowProc(hwnd, msg, wp, lp);
}
/**
* A thread that signals the events[0] when there is input from stdin, then waits for events[0] to be signalled.
*
* It looks like async file reading can't be performed in stdin when it's not a console, so this uses
* the "here's some work, let me know when you're done" pattern.
*/
DWORD WINAPI InputThread(HANDLE events[]) {
HANDLE input = GetStdHandle(STD_INPUT_HANDLE);
HANDLE inputEvent = events[0];
HANDLE inputHandled = events[1];
int buf;
DWORD inputLen;
// Block until there's something in the file
while (ReadFile(input, &buf, 0, &inputLen, NULL)) {
// Tell the main thread something is there, and wait for it to process it.
SignalObjectAndWait(inputEvent, inputHandled, INFINITE, 0);
};
return 0;
}
#ifdef _DEBUG
int main(int argc, char **argv)
#else
int CALLBACK WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, LPSTR cmd, int show)
#endif
{
#define _A2W(x) L##x
#define A2W(x) _A2W(x)
wprintf(L"VERSION %s\r\n" , A2W(__DATE__));
fflush(stdout);
// See if there's already an instance
HANDLE existing = FindWindowEx(getTaskbarWindow(), null, BUTTON_CLASS, null);
if (existing) {
log("Existing tray button found");
// Tell it to die
CloseWindow(existing);
}
WNDCLASS cls = { 0 };
cls.cbWndExtra = sizeof(cls);
cls.lpfnWndProc = buttonWndProc;
cls.lpszClassName = BUTTON_CLASS;
cls.hCursor = LoadCursor(NULL, IDC_ARROW);
if (!RegisterClass(&cls)) {
fail("RegisterClass");
}
if (BufferedPaintInit() != S_OK) {
fail("BufferedPaintInit");
}
RegisterShellHookWindow(buttonWindow);
shellMessage = RegisterWindowMessage(L"SHELLHOOK");
log("Initialised");
// Monitor the availablity of data in stdin.
HANDLE input = GetStdHandle(STD_INPUT_HANDLE);
HANDLE inputEvent = CreateEvent(NULL, FALSE, FALSE, NULL);
HANDLE inputHandled = CreateEvent(NULL, FALSE, FALSE, NULL);
HANDLE events[2] = {inputEvent, inputHandled};
CreateThread(NULL, 0, InputThread, events, 0, NULL);
MSG msg = { 0 };
// Wait for explorer to start
HWND taskbar;
int seconds = 0;
while (!(taskbar = getTaskbarWindow())) {
if (seconds++ == 100) {
fail("No taskbar after %u seconds", seconds);
}
Sleep(1000);
}
log("Found taskbar");
currentDpi = getDpi(taskbar);
checkHighContrast();
DWORD lastError = 0;
do {
// Create the button window
buttonWindow = CreateWindowEx(
WS_EX_TOOLWINDOW,
BUTTON_CLASS,
BUTTON_CLASS,
WS_VISIBLE | WS_CHILD | WS_CLIPSIBLINGS | WS_TABSTOP,
0, 0, BUTTON_WIDTH, 40,
taskbar,
null,
0,
null);
if (!buttonWindow) {
// Sometimes CreateWindowEx fails with ERROR_ACCESS_DENIED (can be reproduced if the start menu is open)
// Also, creating without a parent but using SetParent returns ERROR_INVALID_PARAMETER, under the same
// conditions.
DWORD thisError = GetLastError();
if (thisError != lastError) {
fail("CreateWindowEx (retrying)");
lastError = thisError;
}
Sleep(1000);
}
// Continue trying to create the window if it didn't succeed.
} while (!buttonWindow);
SetTimer(buttonWindow, TIMER_CHECK, TIMER_CHECK_DELAY, null);
while (!die) {
WCHAR inputBuffer[0xfff];
DWORD inputLen;
// Wait for stdin or a window message.
DWORD waitResult = MsgWaitForMultipleObjectsEx(1, &inputEvent, INFINITE, QS_ALLEVENTS, 0);
switch (waitResult) {
case WAIT_OBJECT_0:
// Got input
memset(inputBuffer, 0, sizeof(inputBuffer));
if (ReadFile(input, &inputBuffer, sizeof(inputBuffer) - 2, &inputLen, NULL)) {
gotInput(inputBuffer, inputLen / sizeof(WCHAR));
} else {
die = true;
}
ResetEvent(inputEvent);
SetEvent(inputHandled);
break;
case WAIT_OBJECT_0 + 1:
// Got a new window message
while (PeekMessage(&msg, NULL, 0, 0, PM_REMOVE)) {
if (msg.message == WM_QUIT) {
PostQuitMessage(msg.wParam);
die = true;
break;
}
TranslateMessage(&msg);
DispatchMessage(&msg);
}
break;
}
}
log("Window closed");
hideButton();
BufferedPaintUnInit();
SendMessage(taskbar, WM_WINDOWPOSCHANGED, 0, 0);
log("Stopped")
return msg.wParam;
}