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Examples: DirectX9: Using SetCapture/ReleaseCapture to get correct behavior (#1375)

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This commit is contained in:
omar 2017-10-23 09:43:13 +02:00
parent e03198bb0f
commit 3e0765ee22
1 changed files with 22 additions and 12 deletions
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34
examples/directx9_example/imgui_impl_dx9.cpp
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@ -171,34 +171,44 @@ void ImGui_ImplDX9_RenderDrawLists(ImDrawData* draw_data)
d3d9_state_block->Release(); d3d9_state_block->Release();
} }
static bool IsAnyMouseButtonDown()
{
ImGuiIO& io = ImGui::GetIO();
for (int n = 0; n < ARRAYSIZE(io.MouseDown); n++)
if (io.MouseDown[n])
return true;
return false;
}
// We use Win32 SetCapture/ReleaseCapture() API to enable reading the mouse outside our Windows bounds.
IMGUI_API LRESULT ImGui_ImplDX9_WndProcHandler(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam) IMGUI_API LRESULT ImGui_ImplDX9_WndProcHandler(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{ {
ImGuiIO& io = ImGui::GetIO(); ImGuiIO& io = ImGui::GetIO();
switch (msg) switch (msg)
{ {
case WM_LBUTTONDOWN: case WM_LBUTTONDOWN:
SetCapture(hwnd); if (!IsAnyMouseButtonDown()) ::SetCapture(hwnd);
io.MouseDown[0] = true; io.MouseDown[0] = true;
return true; return true;
case WM_LBUTTONUP:
ReleaseCapture();
io.MouseDown[0] = false;
return true;
case WM_RBUTTONDOWN: case WM_RBUTTONDOWN:
SetCapture(hwnd); if (!IsAnyMouseButtonDown()) ::SetCapture(hwnd);
io.MouseDown[1] = true; io.MouseDown[1] = true;
return true; return true;
case WM_RBUTTONUP:
ReleaseCapture();
io.MouseDown[1] = false;
return true;
case WM_MBUTTONDOWN: case WM_MBUTTONDOWN:
SetCapture(hwnd); if (!IsAnyMouseButtonDown()) ::SetCapture(hwnd);
io.MouseDown[2] = true; io.MouseDown[2] = true;
return true; return true;
case WM_LBUTTONUP:
io.MouseDown[0] = false;
if (!IsAnyMouseButtonDown()) ::ReleaseCapture();
return true;
case WM_RBUTTONUP:
io.MouseDown[1] = false;
if (!IsAnyMouseButtonDown()) ::ReleaseCapture();
return true;
case WM_MBUTTONUP: case WM_MBUTTONUP:
ReleaseCapture();
io.MouseDown[2] = false; io.MouseDown[2] = false;
if (!IsAnyMouseButtonDown()) ::ReleaseCapture();
return true; return true;
case WM_MOUSEWHEEL: case WM_MOUSEWHEEL:
io.MouseWheel += GET_WHEEL_DELTA_WPARAM(wParam) > 0 ? +1.0f : -1.0f; io.MouseWheel += GET_WHEEL_DELTA_WPARAM(wParam) > 0 ? +1.0f : -1.0f;