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added getWindowAccurateBounds() using DwmGetWindowAttribute to get window bounds without the drop shadow #70

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added getWindowAccurateBounds() using DwmGetWindowAttribute to get window bounds without the drop shadow #70

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22 changes: 22 additions & 0 deletions lib/windows.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -4,8 +4,11 @@
#include <napi.h>
#include <shtypes.h>
#include <string>
#include <dwmapi.h>
#include <windows.h>

#pragma comment (lib, "Dwmapi")

typedef int (__stdcall* lp_GetScaleFactorForMonitor) (HMONITOR, DEVICE_SCALE_FACTOR*);

struct Process {
Expand Down Expand Up @@ -201,6 +204,24 @@ Napi::Object getWindowBounds (const Napi::CallbackInfo& info) {
return bounds;
}

Napi::Object getWindowAccurateBounds (const Napi::CallbackInfo& info) {
Napi::Env env{ info.Env () };

auto handle{ getValueFromCallbackData<HWND> (info, 0) };

RECT rect{};
DwmGetWindowAttribute (handle, DWMWA_EXTENDED_FRAME_BOUNDS, &rect, sizeof(RECT));

Napi::Object bounds{ Napi::Object::New (env) };

bounds.Set ("x", rect.left);
bounds.Set ("y", rect.top);
bounds.Set ("width", rect.right - rect.left);
bounds.Set ("height", rect.bottom - rect.top);

return bounds;
}

Napi::String getWindowTitle (const Napi::CallbackInfo& info) {
Napi::Env env{ info.Env () };

Expand Down Expand Up @@ -411,6 +432,7 @@ Napi::Object Init (Napi::Env env, Napi::Object exports) {
exports.Set (Napi::String::New (env, "setWindowOwner"), Napi::Function::New (env, setWindowOwner));
exports.Set (Napi::String::New (env, "initWindow"), Napi::Function::New (env, initWindow));
exports.Set (Napi::String::New (env, "getWindowBounds"), Napi::Function::New (env, getWindowBounds));
exports.Set (Napi::String::New (env, "getWindowAccurateBounds"), Napi::Function::New (env, getWindowAccurateBounds));
exports.Set (Napi::String::New (env, "getWindowTitle"), Napi::Function::New (env, getWindowTitle));
exports.Set (Napi::String::New (env, "getWindowOwner"), Napi::Function::New (env, getWindowOwner));
exports.Set (Napi::String::New (env, "getWindowOpacity"), Napi::Function::New (env, getWindowOpacity));
Expand Down
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