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GetMouseDragDelta(): also returns the delta on the mouse button released frame. Verify that mouse positions are valid otherwise returns zero. Removed obsolete comment. Tweaked demo. (#2419)

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This commit is contained in:
omar
2019-03-15 15:03:37 +01:00
parent ff03ae503b
commit 857381b9ca
4 changed files with 15 additions and 17 deletions
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21
imgui_demo.cpp
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@ -2646,22 +2646,17 @@ static void ShowDemoWindowMisc()
for (int button = 0; button < 3; button++)
ImGui::Text("IsMouseDragging(%d):\n w/ default threshold: %d,\n w/ zero threshold: %d\n w/ large threshold: %d",
button, ImGui::IsMouseDragging(button), ImGui::IsMouseDragging(button, 0.0f), ImGui::IsMouseDragging(button, 20.0f));
ImGui::Button("Drag Me");
if (ImGui::IsItemActive())
{
// Draw a line between the button and the mouse cursor
ImDrawList* draw_list = ImGui::GetWindowDrawList();
draw_list->PushClipRectFullScreen();
draw_list->AddLine(io.MouseClickedPos[0], io.MousePos, ImGui::GetColorU32(ImGuiCol_Button), 4.0f);
draw_list->PopClipRect();
ImGui::GetForegroundDrawList()->AddLine(io.MouseClickedPos[0], io.MousePos, ImGui::GetColorU32(ImGuiCol_Button), 4.0f); // Draw a line between the button and the mouse cursor
// Drag operations gets "unlocked" when the mouse has moved past a certain threshold (the default threshold is stored in io.MouseDragThreshold)
// You can request a lower or higher threshold using the second parameter of IsMouseDragging() and GetMouseDragDelta()
ImVec2 value_raw = ImGui::GetMouseDragDelta(0, 0.0f);
ImVec2 value_with_lock_threshold = ImGui::GetMouseDragDelta(0);
ImVec2 mouse_delta = io.MouseDelta;
ImGui::SameLine(); ImGui::Text("Raw (%.1f, %.1f), WithLockThresold (%.1f, %.1f), MouseDelta (%.1f, %.1f)", value_raw.x, value_raw.y, value_with_lock_threshold.x, value_with_lock_threshold.y, mouse_delta.x, mouse_delta.y);
}
// Drag operations gets "unlocked" when the mouse has moved past a certain threshold (the default threshold is stored in io.MouseDragThreshold)
// You can request a lower or higher threshold using the second parameter of IsMouseDragging() and GetMouseDragDelta()
ImVec2 value_raw = ImGui::GetMouseDragDelta(0, 0.0f);
ImVec2 value_with_lock_threshold = ImGui::GetMouseDragDelta(0);
ImVec2 mouse_delta = io.MouseDelta;
ImGui::Text("GetMouseDragDelta(0):\n w/ default threshold: (%.1f, %.1f),\n w/ zero threshold: (%.1f, %.1f)\nMouseDelta: (%.1f, %.1f)", value_with_lock_threshold.x, value_with_lock_threshold.y, value_raw.x, value_raw.y, mouse_delta.x, mouse_delta.y);
ImGui::TreePop();
}