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SetScrollPosHere() takes a y centering ratio and can be used to aim the top or bottom of the window (relate #150)

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This commit is contained in:
ocornut 2015-07-01 17:51:44 -06:00
parent c39372e7d5
commit b74d8e4c87
2 changed files with 14 additions and 8 deletions
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20
imgui.cpp
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@ -1412,7 +1412,8 @@ struct ImGuiWindow
ImVec2 SizeContents; // Size of contents (== extents reach of the drawing cursor) from previous frame
ImGuiID MoveID; // == window->GetID("#MOVE")
float ScrollY;
float ScrollTargetCenterY; // position which we aim to center on
float ScrollTargetAbsY; // target scroll position. stored as cursor position with scrolling canceled out, so the highest point is always 0.0f. (-1.0f for no change)
float ScrollTargetCenterRatioY; // 0.0f = scroll so that target position is at top, 0.5f = scroll so that target position is centered
bool ScrollbarY;
bool Active; // Set to true on Begin()
bool WasActive;
@ -1778,7 +1779,8 @@ ImGuiWindow::ImGuiWindow(const char* name)
Size = SizeFull = ImVec2(0.0f, 0.0f);
SizeContents = ImVec2(0.0f, 0.0f);
ScrollY = 0.0f;
ScrollTargetCenterY = -1.0f;
ScrollTargetAbsY = -1.0f;
ScrollTargetCenterRatioY = 0.5f;
ScrollbarY = false;
Active = WasActive = false;
Accessed = false;
@ -3836,10 +3838,11 @@ bool ImGui::Begin(const char* name, bool* p_opened, const ImVec2& size_on_first_
window->FocusIdxAllRequestNext = window->FocusIdxTabRequestNext = IM_INT_MAX;
// Apply scrolling
if (window->ScrollTargetCenterY >= 0.0f)
if (window->ScrollTargetAbsY >= 0.0f)
{
window->ScrollY = window->ScrollTargetCenterY - (window->Pos.y + (window->SizeFull.y + window->TitleBarHeight() + window->WindowPadding().y) * 0.5f);
window->ScrollTargetCenterY = -1.0f;
float center_ratio_y = window->ScrollTargetCenterRatioY;
window->ScrollY = window->ScrollTargetAbsY - (window->Pos.y + (1.0f - center_ratio_y) * window->TitleBarHeight() + center_ratio_y * window->SizeFull.y);
window->ScrollTargetAbsY = -1.0f;
}
window->ScrollY = ImMax(window->ScrollY, 0.0f);
if (!window->Collapsed && !window->SkipItems)
@ -4800,10 +4803,13 @@ float ImGui::GetScrollMaxY()
return window->SizeContents.y - window->SizeFull.y;
}
void ImGui::SetScrollPosHere()
void ImGui::SetScrollPosHere(float center_y_ratio)
{
// We store a target position so centering can occur on the next frame when we are guaranteed to have a known window size
IM_ASSERT(center_y_ratio >= 0.0f && center_y_ratio <= 1.0f);
ImGuiWindow* window = GetCurrentWindow();
window->ScrollTargetCenterY = (float)(int)(window->DC.CursorPos.y + window->ScrollY - window->DC.PrevLineHeight * 0.5f);
window->ScrollTargetAbsY = (float)(int)(window->ScrollY + window->DC.CursorPosPrevLine.y + (window->DC.PrevLineHeight) * center_y_ratio);
window->ScrollTargetCenterRatioY = center_y_ratio;
}
void ImGui::SetKeyboardFocusHere(int offset)

2
imgui.h
View File

@ -138,7 +138,7 @@ namespace ImGui
IMGUI_API float GetScrollPosY(); // get scrolling position [0..GetScrollMaxY()]
IMGUI_API float GetScrollMaxY(); // get maximum scrolling position == ContentSize.Y - WindowSize.Y
IMGUI_API void SetScrollPosHere(); // adjust scrolling position to center into the current cursor position
IMGUI_API void SetScrollPosHere(float center_y_ratio = 0.5f); // adjust scrolling position to make the current cursor position visible. center_y_ratio=0.0: top, =0.5: center, =1.0: bottom.
IMGUI_API void SetKeyboardFocusHere(int offset = 0); // focus keyboard on the next widget. Use positive 'offset' to access sub components of a multiple component widget
IMGUI_API void SetStateStorage(ImGuiStorage* tree); // replace tree state storage with our own (if you want to manipulate it yourself, typically clear subsection of it)
IMGUI_API ImGuiStorage* GetStateStorage();