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// Copyright 2014 The PDFium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
#include "fpdfsdk/pwl/cpwl_scroll_bar.h"
#include <math.h>
#include <algorithm>
#include <sstream>
#include <utility>
#include "core/fxcrt/check.h"
#include "core/fxge/cfx_fillrenderoptions.h"
#include "core/fxge/cfx_path.h"
#include "core/fxge/cfx_renderdevice.h"
#include "fpdfsdk/pwl/cpwl_wnd.h"
namespace {
constexpr float kButtonWidth = 9.0f;
constexpr float kPosButtonMinWidth = 2.0f;
} // namespace
void PWL_FLOATRANGE::Reset() {
fMin = 0.0f;
fMax = 0.0f;
}
void PWL_FLOATRANGE::Set(float min, float max) {
fMin = std::min(min, max);
fMax = std::max(min, max);
}
bool PWL_FLOATRANGE::In(float x) const {
return (FXSYS_IsFloatBigger(x, fMin) || FXSYS_IsFloatEqual(x, fMin)) &&
(FXSYS_IsFloatSmaller(x, fMax) || FXSYS_IsFloatEqual(x, fMax));
}
float PWL_FLOATRANGE::GetWidth() const {
return fMax - fMin;
}
PWL_SCROLL_PRIVATEDATA::PWL_SCROLL_PRIVATEDATA() {
Default();
}
void PWL_SCROLL_PRIVATEDATA::Default() {
ScrollRange.Reset();
fScrollPos = ScrollRange.fMin;
fClientWidth = 0;
fBigStep = 10;
fSmallStep = 1;
}
void PWL_SCROLL_PRIVATEDATA::SetScrollRange(float min, float max) {
ScrollRange.Set(min, max);
if (FXSYS_IsFloatSmaller(fScrollPos, ScrollRange.fMin))
fScrollPos = ScrollRange.fMin;
if (FXSYS_IsFloatBigger(fScrollPos, ScrollRange.fMax))
fScrollPos = ScrollRange.fMax;
}
void PWL_SCROLL_PRIVATEDATA::SetClientWidth(float width) {
fClientWidth = width;
}
void PWL_SCROLL_PRIVATEDATA::SetSmallStep(float step) {
fSmallStep = step;
}
void PWL_SCROLL_PRIVATEDATA::SetBigStep(float step) {
fBigStep = step;
}
bool PWL_SCROLL_PRIVATEDATA::SetPos(float pos) {
if (ScrollRange.In(pos)) {
fScrollPos = pos;
return true;
}
return false;
}
void PWL_SCROLL_PRIVATEDATA::AddSmall() {
if (!SetPos(fScrollPos + fSmallStep))
SetPos(ScrollRange.fMax);
}
void PWL_SCROLL_PRIVATEDATA::SubSmall() {
if (!SetPos(fScrollPos - fSmallStep))
SetPos(ScrollRange.fMin);
}
void PWL_SCROLL_PRIVATEDATA::AddBig() {
if (!SetPos(fScrollPos + fBigStep))
SetPos(ScrollRange.fMax);
}
void PWL_SCROLL_PRIVATEDATA::SubBig() {
if (!SetPos(fScrollPos - fBigStep))
SetPos(ScrollRange.fMin);
}
CPWL_ScrollBar::CPWL_ScrollBar(
const CreateParams& cp,
std::unique_ptr<IPWL_FillerNotify::PerWindowData> pAttachedData)
: CPWL_Wnd(cp, std::move(pAttachedData)) {
GetCreationParams()->eCursorType = IPWL_FillerNotify::CursorStyle::kArrow;
}
CPWL_ScrollBar::~CPWL_ScrollBar() = default;
void CPWL_ScrollBar::OnDestroy() {
// Until cleanup takes place in the virtual destructor for CPWL_Wnd
// subclasses, implement the virtual OnDestroy method that does the
// cleanup first, then invokes the superclass OnDestroy ... gee,
// like a dtor would.
m_pMinButton.ExtractAsDangling();
m_pMaxButton.ExtractAsDangling();
m_pPosButton.ExtractAsDangling();
CPWL_Wnd::OnDestroy();
}
bool CPWL_ScrollBar::RepositionChildWnd() {
ObservedPtr<CPWL_ScrollBar> this_observed(this);
CFX_FloatRect rcClient = this_observed->GetClientRect();
CFX_FloatRect rcMinButton;
CFX_FloatRect rcMaxButton;
if (FXSYS_IsFloatBigger(rcClient.top - rcClient.bottom,
kButtonWidth * 2 + kPosButtonMinWidth + 2)) {
rcMinButton = CFX_FloatRect(rcClient.left, rcClient.top - kButtonWidth,
rcClient.right, rcClient.top);
rcMaxButton = CFX_FloatRect(rcClient.left, rcClient.bottom, rcClient.right,
rcClient.bottom + kButtonWidth);
} else {
float fBWidth =
(rcClient.top - rcClient.bottom - kPosButtonMinWidth - 2) / 2;
if (FXSYS_IsFloatBigger(fBWidth, 0)) {
rcMinButton = CFX_FloatRect(rcClient.left, rcClient.top - fBWidth,
rcClient.right, rcClient.top);
rcMaxButton = CFX_FloatRect(rcClient.left, rcClient.bottom,
rcClient.right, rcClient.bottom + fBWidth);
} else {
if (!this_observed->SetVisible(false)) {
return false;
}
}
}
if (this_observed->m_pMinButton) {
this_observed->m_pMinButton->Move(rcMinButton, true, false);
if (!this_observed) {
return false;
}
}
if (this_observed->m_pMaxButton) {
this_observed->m_pMaxButton->Move(rcMaxButton, true, false);
if (!this_observed) {
return false;
}
}
return this_observed->MovePosButton(false);
}
void CPWL_ScrollBar::DrawThisAppearance(CFX_RenderDevice* pDevice,
const CFX_Matrix& mtUser2Device) {
CFX_FloatRect rectWnd = GetWindowRect();
if (IsVisible() && !rectWnd.IsEmpty()) {
pDevice->DrawFillRect(&mtUser2Device, rectWnd, GetBackgroundColor(),
GetTransparency());
pDevice->DrawStrokeLine(
&mtUser2Device, CFX_PointF(rectWnd.left + 2.0f, rectWnd.top - 2.0f),
CFX_PointF(rectWnd.left + 2.0f, rectWnd.bottom + 2.0f),
ArgbEncode(GetTransparency(), 100, 100, 100), 1.0f);
pDevice->DrawStrokeLine(
&mtUser2Device, CFX_PointF(rectWnd.right - 2.0f, rectWnd.top - 2.0f),
CFX_PointF(rectWnd.right - 2.0f, rectWnd.bottom + 2.0f),
ArgbEncode(GetTransparency(), 100, 100, 100), 1.0f);
}
}
bool CPWL_ScrollBar::OnLButtonDown(Mask<FWL_EVENTFLAG> nFlag,
const CFX_PointF& point) {
CPWL_Wnd::OnLButtonDown(nFlag, point);
if (HasFlag(PWS_AUTOTRANSPARENT)) {
if (GetTransparency() != 255) {
SetTransparency(255);
if (!InvalidateRect(nullptr))
return true;
}
}
if (m_pPosButton && m_pPosButton->IsVisible()) {
CFX_FloatRect rcClient = GetClientRect();
CFX_FloatRect rcPosButton = m_pPosButton->GetWindowRect();
CFX_FloatRect rcMinArea =
CFX_FloatRect(rcClient.left, rcPosButton.top, rcClient.right,
rcClient.top - kButtonWidth);
CFX_FloatRect rcMaxArea =
CFX_FloatRect(rcClient.left, rcClient.bottom + kButtonWidth,
rcClient.right, rcPosButton.bottom);
rcMinArea.Normalize();
rcMaxArea.Normalize();
if (rcMinArea.Contains(point)) {
m_sData.SubBig();
if (!MovePosButton(true))
return true;
NotifyScrollWindow();
}
if (rcMaxArea.Contains(point)) {
m_sData.AddBig();
if (!MovePosButton(true))
return true;
NotifyScrollWindow();
}
}
return true;
}
bool CPWL_ScrollBar::OnLButtonUp(Mask<FWL_EVENTFLAG> nFlag,
const CFX_PointF& point) {
CPWL_Wnd::OnLButtonUp(nFlag, point);
if (HasFlag(PWS_AUTOTRANSPARENT)) {
if (GetTransparency() != kTransparency) {
SetTransparency(kTransparency);
if (!InvalidateRect(nullptr))
return true;
}
}
m_pTimer.reset();
m_bMouseDown = false;
return true;
}
void CPWL_ScrollBar::SetScrollInfo(const PWL_SCROLL_INFO& info) {
if (info == m_OriginInfo)
return;
m_OriginInfo = info;
float fMax =
std::max(0.0f, info.fContentMax - info.fContentMin - info.fPlateWidth);
SetScrollRange(0, fMax, info.fPlateWidth);
SetScrollStep(info.fBigStep, info.fSmallStep);
}
void CPWL_ScrollBar::SetScrollPosition(float pos) {
pos = m_OriginInfo.fContentMax - pos;
SetScrollPos(pos);
}
void CPWL_ScrollBar::NotifyLButtonDown(CPWL_Wnd* child, const CFX_PointF& pos) {
if (child == m_pMinButton)
OnMinButtonLBDown(pos);
else if (child == m_pMaxButton)
OnMaxButtonLBDown(pos);
else if (child == m_pPosButton)
OnPosButtonLBDown(pos);
}
void CPWL_ScrollBar::NotifyLButtonUp(CPWL_Wnd* child, const CFX_PointF& pos) {
if (child == m_pMinButton)
OnMinButtonLBUp(pos);
else if (child == m_pMaxButton)
OnMaxButtonLBUp(pos);
else if (child == m_pPosButton)
OnPosButtonLBUp(pos);
}
void CPWL_ScrollBar::NotifyMouseMove(CPWL_Wnd* child, const CFX_PointF& pos) {
if (child == m_pMinButton)
OnMinButtonMouseMove(pos);
else if (child == m_pMaxButton)
OnMaxButtonMouseMove(pos);
else if (child == m_pPosButton)
OnPosButtonMouseMove(pos);
}
void CPWL_ScrollBar::CreateButtons(const CreateParams& cp) {
ObservedPtr<CPWL_ScrollBar> this_observed(this);
CreateParams scp = cp;
scp.dwBorderWidth = 2;
scp.nBorderStyle = BorderStyle::kBeveled;
scp.dwFlags = PWS_VISIBLE | PWS_BORDER | PWS_BACKGROUND | PWS_NOREFRESHCLIP;
if (!this_observed->m_pMinButton) {
auto pButton =
std::make_unique<CPWL_SBButton>(scp, this_observed->CloneAttachedData(),
CPWL_SBButton::Type::kMinButton);
this_observed->m_pMinButton = pButton.get();
this_observed->AddChild(std::move(pButton));
this_observed->m_pMinButton->Realize();
}
if (!this_observed->m_pMaxButton) {
auto pButton =
std::make_unique<CPWL_SBButton>(scp, this_observed->CloneAttachedData(),
CPWL_SBButton::Type::kMaxButton);
this_observed->m_pMaxButton = pButton.get();
this_observed->AddChild(std::move(pButton));
this_observed->m_pMaxButton->Realize();
}
if (!this_observed->m_pPosButton) {
auto pButton =
std::make_unique<CPWL_SBButton>(scp, this_observed->CloneAttachedData(),
CPWL_SBButton::Type::kPosButton);
this_observed->m_pPosButton = pButton.get();
if (this_observed->m_pPosButton->SetVisible(false) && this_observed) {
this_observed->AddChild(std::move(pButton));
this_observed->m_pPosButton->Realize();
}
}
}
float CPWL_ScrollBar::GetScrollBarWidth() const {
return IsVisible() ? kWidth : 0.0f;
}
void CPWL_ScrollBar::SetScrollRange(float fMin,
float fMax,
float fClientWidth) {
ObservedPtr<CPWL_ScrollBar> this_observed(this);
if (!this_observed->m_pPosButton) {
return;
}
this_observed->m_sData.SetScrollRange(fMin, fMax);
this_observed->m_sData.SetClientWidth(fClientWidth);
if (FXSYS_IsFloatSmaller(this_observed->m_sData.ScrollRange.GetWidth(),
0.0f)) {
(void)this_observed->m_pPosButton->SetVisible(false);
// Note, |this| may no longer be viable at this point. If more work needs
// to be done, check this_observed.
return;
}
if (!this_observed->m_pPosButton->SetVisible(true) || !this_observed) {
return;
}
(void)this_observed->MovePosButton(true);
// Note, |this| may no longer be viable at this point. If more work needs
// to be done, check the return value of MovePosButton().
}
void CPWL_ScrollBar::SetScrollPos(float fPos) {
float fOldPos = m_sData.fScrollPos;
m_sData.SetPos(fPos);
if (!FXSYS_IsFloatEqual(m_sData.fScrollPos, fOldPos)) {
(void)MovePosButton(true);
// Note, |this| may no longer be viable at this point. If more work needs
// to be done, check the return value of MovePosButton().
}
}
void CPWL_ScrollBar::SetScrollStep(float fBigStep, float fSmallStep) {
m_sData.SetBigStep(fBigStep);
m_sData.SetSmallStep(fSmallStep);
}
bool CPWL_ScrollBar::MovePosButton(bool bRefresh) {
ObservedPtr<CPWL_ScrollBar> this_observed(this);
DCHECK(m_pMinButton);
DCHECK(m_pMaxButton);
if (this_observed->m_pPosButton->IsVisible()) {
CFX_FloatRect rcPosArea = this_observed->GetScrollArea();
float fTop = this_observed->TrueToFace(m_sData.fScrollPos);
float fBottom =
this_observed->TrueToFace(m_sData.fScrollPos + m_sData.fClientWidth);
if (FXSYS_IsFloatSmaller(fTop - fBottom, kPosButtonMinWidth)) {
fBottom = fTop - kPosButtonMinWidth;
}
if (FXSYS_IsFloatSmaller(fBottom, rcPosArea.bottom)) {
fBottom = rcPosArea.bottom;
fTop = fBottom + kPosButtonMinWidth;
}
CFX_FloatRect rcPosButton =
CFX_FloatRect(rcPosArea.left, fBottom, rcPosArea.right, fTop);
this_observed->m_pPosButton->Move(rcPosButton, true, bRefresh);
if (!this_observed) {
return false;
}
}
return true;
}
void CPWL_ScrollBar::OnMinButtonLBDown(const CFX_PointF& point) {
m_sData.SubSmall();
if (!MovePosButton(true))
return;
NotifyScrollWindow();
m_bMinOrMax = true;
m_pTimer = std::make_unique<CFX_Timer>(GetTimerHandler(), this, 100);
}
void CPWL_ScrollBar::OnMinButtonLBUp(const CFX_PointF& point) {}
void CPWL_ScrollBar::OnMinButtonMouseMove(const CFX_PointF& point) {}
void CPWL_ScrollBar::OnMaxButtonLBDown(const CFX_PointF& point) {
m_sData.AddSmall();
if (!MovePosButton(true))
return;
NotifyScrollWindow();
m_bMinOrMax = false;
m_pTimer = std::make_unique<CFX_Timer>(GetTimerHandler(), this, 100);
}
void CPWL_ScrollBar::OnMaxButtonLBUp(const CFX_PointF& point) {}
void CPWL_ScrollBar::OnMaxButtonMouseMove(const CFX_PointF& point) {}
void CPWL_ScrollBar::OnPosButtonLBDown(const CFX_PointF& point) {
m_bMouseDown = true;
if (m_pPosButton) {
CFX_FloatRect rcPosButton = m_pPosButton->GetWindowRect();
m_nOldPos = point.y;
m_fOldPosButton = rcPosButton.top;
}
}
void CPWL_ScrollBar::OnPosButtonLBUp(const CFX_PointF& point) {
m_bMouseDown = false;
}
void CPWL_ScrollBar::OnPosButtonMouseMove(const CFX_PointF& point) {
if (fabs(point.y - m_nOldPos) < 1)
return;
float fOldScrollPos = m_sData.fScrollPos;
float fNewPos = FaceToTrue(m_fOldPosButton + point.y - m_nOldPos);
if (m_bMouseDown) {
if (FXSYS_IsFloatSmaller(fNewPos, m_sData.ScrollRange.fMin)) {
fNewPos = m_sData.ScrollRange.fMin;
}
if (FXSYS_IsFloatBigger(fNewPos, m_sData.ScrollRange.fMax)) {
fNewPos = m_sData.ScrollRange.fMax;
}
m_sData.SetPos(fNewPos);
if (!FXSYS_IsFloatEqual(fOldScrollPos, m_sData.fScrollPos)) {
if (!MovePosButton(true))
return;
NotifyScrollWindow();
}
}
}
void CPWL_ScrollBar::NotifyScrollWindow() {
CPWL_Wnd* pParent = GetParentWindow();
if (!pParent)
return;
pParent->ScrollWindowVertically(m_OriginInfo.fContentMax -
m_sData.fScrollPos);
}
CFX_FloatRect CPWL_ScrollBar::GetScrollArea() const {
CFX_FloatRect rcClient = GetClientRect();
if (!m_pMinButton || !m_pMaxButton)
return rcClient;
CFX_FloatRect rcMin = m_pMinButton->GetWindowRect();
CFX_FloatRect rcMax = m_pMaxButton->GetWindowRect();
float fMinHeight = rcMin.Height();
float fMaxHeight = rcMax.Height();
CFX_FloatRect rcArea;
if (rcClient.top - rcClient.bottom > fMinHeight + fMaxHeight + 2) {
rcArea = CFX_FloatRect(rcClient.left, rcClient.bottom + fMinHeight + 1,
rcClient.right, rcClient.top - fMaxHeight - 1);
} else {
rcArea = CFX_FloatRect(rcClient.left, rcClient.bottom + fMinHeight + 1,
rcClient.right, rcClient.bottom + fMinHeight + 1);
}
rcArea.Normalize();
return rcArea;
}
float CPWL_ScrollBar::TrueToFace(float fTrue) {
CFX_FloatRect rcPosArea = GetScrollArea();
float fFactWidth = m_sData.ScrollRange.GetWidth() + m_sData.fClientWidth;
fFactWidth = fFactWidth == 0 ? 1 : fFactWidth;
return rcPosArea.top -
fTrue * (rcPosArea.top - rcPosArea.bottom) / fFactWidth;
}
float CPWL_ScrollBar::FaceToTrue(float fFace) {
CFX_FloatRect rcPosArea = GetScrollArea();
float fFactWidth = m_sData.ScrollRange.GetWidth() + m_sData.fClientWidth;
fFactWidth = fFactWidth == 0 ? 1 : fFactWidth;
return (rcPosArea.top - fFace) * fFactWidth /
(rcPosArea.top - rcPosArea.bottom);
}
void CPWL_ScrollBar::CreateChildWnd(const CreateParams& cp) {
CreateButtons(cp);
}
void CPWL_ScrollBar::OnTimerFired() {
PWL_SCROLL_PRIVATEDATA sTemp = m_sData;
if (m_bMinOrMax)
m_sData.SubSmall();
else
m_sData.AddSmall();
if (sTemp == m_sData)
return;
if (!MovePosButton(true))
return;
NotifyScrollWindow();
}